中国語は表意文字を用いるので、外国語を音どおり表記することが難しいです。しかし、漢字は読み方がたいてい１つだけなので、非常に合理的です。

Because of using Ideograms, Chinese has difficulty to express sounds of foreign languages accurately
However, Chinese character is very rational because most of Chinese characters have only one pronunciation.