force是力或者武力的意思，而focus则是焦点或者专注于的意思，区别可以从以下例子看出：
When you apply your force in this woods, you need to focus on the right point, then you will do it easily. 当你在这木中施力时，你需要专注于正确的点，然后你会很容易做到
水利万物而不争,
而万物莫能与之争。
