摘要：
burstintolaughter突然笑出声来concentrateon...全神贯注于...bereplacedby被...所取代forthepurposeof...为了...,... 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...
enable sb. to do ... 使某人能够做某事
wave goodbye 挥别
in sympathy with 同情 赞成 和...一致
