In order for fire to burn, air is necessary, hence the necessity of the breath.

为了让火燃烧，空气是必要的，因此呼吸的必要性。

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In case of necessity, necessary session can be held on the vessel.

必要时，必须的开庭可在船舶长举行。

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In case of necessity necessary session can be held on the vessel.

必要时必需开庭可船舶上进行。

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In case of necessity necessary session can be held on the vessel.

必要时必需开庭可船舶上进行。

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