D50-20170318-writting study-135
1.现在完成时讲述的是过去到现在的影响。若没有到现在，要用过去完成时。
E.g. In conclusion, the rates of birth in China and the USA had filled/ felt between 1920 and 2000.
2. Enable to
E.g. On the contrary, there was a significant surge in 1950 for the rates of china and the USA at just up to 20% and 15% respectively.
3. Waist 腰
Waste 浪费
4. Rather adv. 不是動詞
People would rather talk to the people by phone than communicate to who are right next to them.
