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It has been found that certain bats emit squeaks and by receiving the echoes,

人們發現，某些蝙蝠能發出尖叫聲，

the bank must recognize its customer's signature.

因為銀行有責任辯認出其儲戶的簽名。

Almost any day a young porpoise may be seen trying to turn a 300-pound sea turtle over by sticking his snout under the edge of his shell and pushing up for dear life.

幾乎每天都可以看到一只小海豚把鼻子頂入一只300磅重的海龜的硬殼下面，拼命地把它翻過來。

probably vertical, cliffs, and gentle sediment-covered terraces,

乃至垂直的峭壁和沉積物覆蓋的緩和的階梯地帶，

Arthur C.Clark once suggested a revolutionary idea passes through three phases:

Arthur C.Clark曾經提出，一個革命性的想法經過三個階段：

Two assistants, mounted on tame elephants, control the captive from either side,

兩位助手騎在馴服的象的背上，從兩側控制新捕的象，