We should learn from easy to difficult.
学习应该由易到难。
The reading materials are arranged from easy to difficult.
阅读材料是由易到难安排的。
A small business is not difficult, from big to strong is not easy.
一个企业由小到大不难，由大到强不易。
It is easy to from a plan, but it is difficult to carry it out.
制定计划很容易，但是执行起来很困难。
It is easy to from a plan, but it is difficult to carry it out.
制定计划很容易，但是执行起来很困难。
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