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n which they feed. This echo-location in bats is often compared with radar, th
e 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。 (来源：英语杂志 http://www.EnglishCN.com)
100. As the time and cost of making a clip drop to a few days and a few hundre
d dollars, engineers may soon be free to let their imaginations soar without b
eing penalized by expensive failure.
100.随着芯片制造时间和费用降低到了几天和几百美元，工程师们可能很快可以任他们的
想象驰骋而不会被昂贵的失败所惩罚。
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