side by side 并排, 并肩
learn ... by heart 用心学习
combine ... with ... 与...结合
in that circumstances 如果是那样的话
replace ... with ... 用...代替...
keep a record of 记录
comments on ... 关于...的意见
at least 至少来源：
speak about 谈及
expect of/from... 从...当中期待
in return 作为回报
the survey on ... 关于...的调查
differ in... 在...不同
emerge from... 从...出现
be satisfied with...
play ... roles 扮演...的角色
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...
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
