There is a popular Chinese saying that "Fair skin(皮肤) will make up for three flaws(缺陷)".

中国有句俗话，"一白遮三丑"。

In China, it's natural and important for a host (主人) to make a lively atmosphere (气氛).

在中国，主人营造热闹的气氛是很自然也很重要的。

So, they decided to make small changes to the enzyme by adding some amino acids (氨基酸).

因此，他们决定通过添加一些氨基酸对该酶进行小的改动。

If your workplace is full of distractions (使人分心的事), you'll need to make some changes.

如果你的工作场所有很多人让你分心的事，你需要做出一些改变。

He was a teacher who reformed (改革) English to make American identity (特征) stronger.

他是一名教师，他改革了英语，使美式英语的特点更加鲜明。