前7-9期句型总结：
X is easy to decry but hard to prevent.【棘手问题】
the rearview mirror 后视镜，引申为“过去”
look in the rearview mirror 借鉴过去
in the rearview mirror 成为过去
go a day without
Whether ... remains to be seen. / It remains to be seen whether ... 拭目以待，有待观察，走着瞧，日后见分晓
【举例】
To ..., witness...
...（陈述一个事实）, as witnessed by something
...（陈述一个事实）. Witness...
...（某趋势）has been much heralded in recent years. ......已然是大势所趋【趋势】
It is axiomatic that ...（某现象） .......不言自明，显而易见
Opinion is still divided over whether... is a cause for concern or a chance for... to...【意见分歧】【利弊】
Worries/... have emerged in a wide range of areas, from... to... In..., too, ...【问题】【现象】
...（现象A）At the other end of the spectrum,...（现象B）【相反】【对比】
