three rapid digestion methods

例句：

1. 1.We need three people to finish the project.
   我们需要三个人来完成这个项目。
2. 2. The company has grownthreefold in the past five years.
   这家公司在过去五年里增长了三倍。
3. 3. Three isa magic number in mathematics.
   在数学中，三是一个神奇的数字。