Chapter 521 (2/2)

”I didn't pay any attention to those little tree people. What I worried about was another thing...” Cao Ke's face was not as excited as Phoenix. After listening to Phoenix, Cao Ke murmured to himself: ”maybe our real trouble is the moment we see the natural debris...”

The excited Phoenix Contact obviously didn't hear what Cao Ke said clearly, and subconsciously asked, ”what did you say, Cao Ke boy? I didn't hear you

”If I don't hear you clearly, I'll forget it!” Cao Ke is very helpless to answer a way: ”you carry out your own task to go well!”

”Don't worry! It's all right Phoenix patted his chest confidently.

As Cao Ke expected, with the help of Phoenix's gain, he was not able to compete with a wave of more than a dozen small tree people! Those little tree people were killed by Cao Ke as soon as they came out. After 50 waves of small tree people were killed, Cao Ke's speed didn't drop even a little. It was like a jumping lightning all the time, moving around in the narrow cave space at a high speed!

It's another blow to wipe out a wave of little tree people! Phoenix stares at his small eyes and looks deep into the dark cave. He can't help but curse: ”he's a real cat! At your speed, from the time we met the first wave of little tree people, our galloping distance is not dozens of kilometers! Why don't I have the feeling that I'm going to reach the deepest part of the cave? Who built this cave? Is there a head? ”

Cao Ke frowned and said, ”yes! Even if I have the help of Kirin fire, the power consumption is not so huge, but I can't stand such endless output Tens of kilometers deep cave, this is really some fabulous!... ”

After a pause, Cao Ke turned his head and said to Phoenix, ”stupid bird, do you have any way to explore the depth of the cave first?”

Phoenix a Leng, thought for a while, should say: ”there is a way, that is, I don't know whether it works or not.”

”No problem! If you have a way, use it as soon as possible! ” Cao Ke urged: ”now I have to get a general data to let me know how long I need to stay in this state. If the cave is still very deep, then I have to consider whether I should quit the cave first... After all, my source is limited, so I have to leave some for our retreat! Now behind us, it is estimated that more than 40 waves of little tree people can recover! These are obstacles and stumbling blocks for us to retreat safely! ”

”Well!” Phoenix naturally understood what zouk meant, and saw it take a breath, then opened its small mouth like a hook, and let out a scream towards the depth of the cave!

This scream is essentially different from the ordinary one! Ordinary shrieks are equally sharp, but they spread outward in a divergent form. The closer you stand to the sound source, the louder you hear. And Phoenix's scream, as early as its throat brewing time, was its source force beam into a thin thread! Even when chouk, who is only a few centimeters away from Phoenix, hears the scream of Phoenix, he thinks that his ears are out of order... Is the sound similar to the sound of a mosquito made by a phoenix like Phoenix? Are you kidding? How long has Phoenix not had a good meal to make its voice sound so feeble

In fact, what Cao Ke didn't know was that the reason why he heard the scream of Phoenix was so small was completely determined by the particularity of the scream! Phoenix has been forced into a thin line of sound, most of the natural direction of transmission is in front of Phoenix! The sound that Zoke heard next to Phoenix was just the sound that the real scream leaked out in the process of transmission, which caused the secondary formation of air fluctuation!

If Zoke is right in front of Phoenix, the cry of Phoenix that Zoke can hear will even shatter his eardrum!

Phoenix has its own consideration in this way of screaming! Cao Ke asked Phoenix to explore the depth of the cave. Phoenix had no way to explore it by himself, and voice became the best means of exploration! Phoenix uses its unique ”force sound into a line” skill to project sound deep into the cave. Once the sound reaches the bottom of the cave, it will naturally be bounced back by the cave wall. In this way, Phoenix will be able to rely on the volume, time and other factors of the rebounded sound, Roughly judge how long they have to go from the deepest part of the cave!

In order to make the sound complete such a long-distance exploration and then bounce back, Phoenix must concentrate the direction of sound transmission as much as possible. In this way, it will naturally form this strange situation in front of us. Only in this way can Cao Ke, who is close to it, hear its call like a mosquito humming