by necessity 
必然地, 不可避免地
- She was driven by necessity to steal food for her starving children.
环境逼得她为挨饿的儿女偷窃食物. - By necessity; by force of circumstance.
强制地通过需要;通过环境的力量 - I was compelled to do so by absolute necessity.
我因绝对的需要,被迫这样做的。
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