对于美国汉语学习者而言，最大的挑战毫无疑问是书写体系。

So the biggest challenge for American learners of Chinese is definitely the writing system.

youdao

对于美国汉语学习者而言，最大的挑战毫无疑问是书写体系。

So the biggest challenge for American learners of Chinese is definitely the writing system.

youdao