原级：quicken
现在分词：quickening
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过去分词：quickened
过去式：quickened
1. As the ageing of the population quickens, the number of elderly people is becoming very large.
2. As the aging of the population quickens, the number of elderly people is becoming very large.
3. Kuang said human activities are concentrated north of the equator, which quickens the global warming process in the northern hemisphere.
4. As the population's ageing quickens, the number of elderly people is becoming increasingly large.