摘要：
leanover...弯下身子俯身于...之上turnout结果是,证明是insilence在沉默中burstintolaughter突然笑出声来concentrateon...全... lean over... 弯下身子 俯身于...之上
turn out 结果是,证明是
in silence 在沉默中
burst into laughter 突然笑出声来
concentrate on ... 全神贯注于...
be replaced by 被...所取代
for the purpose of... 为了..., 因...起见
distinguish ... from ... 区分...与...
communicate with... 与...交流
one another 彼此,相互
by means of... 用...的方法
at the approach of... 在...快到的时候
differ from... 与...不同
for instance 举例来说
divide ... into ... 把...分成...
