英语语法分析

Genetic factors also had direct relationship to shortsightedness.

遗传因素与近视发生有直接关系。

We have to protect our eyes, prevent them from the shortsightedness.

我们必须要保护我们的眼睛，预防眼睛近视。

Greed and shortsightedness didn't suddenly burst forth; they are constants of human nature.

贪婪和短视并非突然出现，而是人的天性。