A good deadline is a bit challenging, without being unrealistic.
一个适合的期限是有点难度，但并非不切实际。
I found the English homework was a bit challenging for me at first.
刚开始时我发现英语家庭作业对我来说有点挑战性。
I found that the homework was not as heavy as what I used to get in my old school. However, it was a bit challenging for me at first, because all the homework was in English.
我发现这里布置的家庭作业不像我以前在原来学校时那么繁重，可是一开始我还是觉得有点挑战性，因为所有的作业都是英文的。
I found the homework was not as heavy as what I used to get in my old school, but it was a bit challenging for me at first because all the homework was in English.
我发现家庭作业并没有我过去在原来学校的那么重，但刚开始对我来说确有一点挑战，因为所有的作业都用英语。
I found the homework was not as heavy as what I used to get in my old school, but it was a bit challenging for me at first because all the homework was in English.
我发现家庭作业并没有我过去在原来学校的那么重，但刚开始对我来说确有一点挑战，因为所有的作业都用英语。
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