A prolonged drought had necessitated the introduction of water rationing. [VERB noun/verb-ing]
由于持续干旱,用水需要实行配给了。
Frank was carrying out fuel-system tests which necessitated turning the booster pumps off. [VERB noun/-ing]
弗兰克在做燃料系统测试,这一测试需要关掉升压泵。
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