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1·Lack of sleep is a major factor in loss of libido.

睡眠不足是导致力必多丧失的一个主要因素。《柯林斯英汉双解大词典》

2·Physical activity is an important factor in maintaining fitness.

体育活动是保持健康的一个重要因素。《柯林斯英汉双解大词典》

3·Stress is often a factor in the development of long-term sickness.

心理压力常常是形成长期病的一个因素。《牛津词典》

4·Unemployment is the single most important factor in the growing crime rates.

失业是犯罪率日益上升最重要的一个因素。《牛津词典》

5·The major factor in the decision to stay or to leave was usually professional.

决定去留的主要因素通常与职业相关。《柯林斯英汉双解大词典》

6·The closure of the mine was the single most important factor in the town's decline.

矿山的关闭是这个镇衰落的唯一最重要的因素。《牛津词典》

7·Remember that confidence is the key factor in success.

要记住自信是成功的关键因素。

8·Predators are an essential factor in maintaining communities that are rich and diverse in species.

捕食者是维持群落物种丰富多样的一个重要因素。

9·The latter was an important factor in attracting settlers to the United States during the 19th century.

后者是19世纪吸引移民到美国的一个重要因素。

10·Together with predation, it is the most important density-dependent factor in regulating population growth.

在调节种群增长方面，它与捕食一起是最重要的密度制约因子。