编者按：美国各大学对托福成绩要求有逐年增高趋势，这对同学们提出了更高的挑战。在托福考试中会遇到很多长难的句子结构，无忧托福网特整理汇编100句结构和内容都很经典的英文句子献给大家，祝同学们在考T的道路上勇往直前！

　　99. It has been found that certain bats emit squeaks and by receiving the echoes, they can locate and steer clear of obstacles------or locate flying insects on which they feed. This echo-location in bats is often compared with radar, the principle of which is similar.

　　99.人们已经发现，某些蝙蝠发出尖叫声并靠接受回响来锁定和避免障碍物——或者找到它们赖以为生的昆虫。蝙蝠这种回响定位法常拿来和原理与之很相近似的雷达相比。

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