hard（辛苦地） as(作为） at(按照）初一水平造句

“teather，I don't not hard as at what meaning is it。”
“老师，我不知道辛苦的、作为、按照是什么意思”

As a policeman,I must work very hard at night.

作为一个警察，我必须在晚上非常努力的工作。