The prison governor has refused to let him go, saying he must first be given authority from his own superiors.

监狱长已拒绝释放他，说他必须首先得到上级的许可。

《柯林斯英汉双解大词典》

Caressing Heidi's curly hair, he said, "Now I must go, Heidi!"

抚摸着海蒂的卷发，他说：“我现在必须走了，海蒂！”

youdao

He must obey it instantly, and go.

他必须立即服从命令，然后前往。

youdao

He walked toward the lake. He did not want to fight, but the man must go.

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And, of course,now for the rest of his life, he must just go about as a kind of a beggar, having been this former tremendously great king.

当初至高无上的明君,在他的余生中,只能乞讨度日

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He must not be bound by a rigid set of rules that he must go through before he can open fire.

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He stays late at the office, and feels he must go out drinking with his colleagues to win promotion.

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He says, if he must go against his will, his first order of business will be to try to find family members who evacuated.

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