beard and hair
你要朝哪个方向转，必须发出信号。
You must signal which way you are going to turn.
《牛津词典》
现在我必须发电报叫你父亲来。
Now I must telegraph your father to come.
youdao
“有一件事，”彼得接着说，“凡是为我效劳的人都必须发誓，你也必须发誓。”
"There is one thing," Peter continued, "that every boy who serves under me has to promise, and so must you."
须发，拼音xū fà，是指胡须和头发的统称。
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