名词
中文翻译:Unknown
同义词:
['source', 'driving force', 'impetus', 'force of nature', 'instigator']
例句:
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1. The sourceof the problem is still unknown.
问题的根源仍然未知。
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2. The driving force behind this trend is the increasing demand for eco-friendly products.
这一趋势背后的驱动力是人们对环保产品的日益增长的需求。
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3. The force of nature can be a powerful motivator for change.
自然界的力量可以成为变革的强大推动力。