重点讲解：
1. a couple of 两个；几个；
例句：Across the street from me there are a couple of police officers standing guard.
我对面的街上有几名警官在站岗6O71*uwR8g=(%|%。
2. for some reason 不知为何；不知什么原因；
例句：For some inexplicable reason she was attracted to Patrick.
因为某些无法解释的原因，她被帕特里克所吸引lTg9k1u3c]。
3. contribute to 促成；促使；是导致…的原因之一；
例句：Honesty and hard work contribute to success and happiness.
诚实加苦干有助于成功和幸福!+mMW(eIx[#Zb#9U2。
4. in fact 用于修正、引出相反意见或对比等）事实上，其实；
例句：That sounds rather simple, but in fact it's very difficult.
那听来简单，但实际上很难CaCE]~*nqp2RG。