It needs must be so.

必然如此.

《现代英汉综合大词典》

A man needs must lie down when he sleeps.

人睡时非躺下来不可.

辞典例句

Needs must when the devil drives.

st.形势所迫不得不为.

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Involving work or social needs must be the degree of effective control, the number of frequencies.

对于涉及工作或者社交需要的,一定要有效控制程度 、 数量、频率.

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I don't think the walls need repainting; but needs must, I suppose , if I any peace.

我认为这些墙不需要重漆, 但是情势所迫,为了相安无事, 我只得重漆.

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