1. The sheer ferocity of the accident might have had lessened its environmental impact. 这起事故的严重程度本可以减轻其对环境的影响。
2. As the air space around them is lessened by compaction and melting, the grains become denser. 由于它们周围的空气被压缩、融化而逐渐减少，颗粒变得更加密集了。
3. Seventy-four percent of the women said the activity lessened their fears and kept them from thinking about their problem. 74%的女性表示，这种活动减轻了她们的恐惧，让她们不去想自己的问题。
4. Moreover, when the antibody was given to chimpanzees, it inhibited rhinoviral growth, and in humans it lessened both the severity and duration of cold symptoms. 此外，当把这种抗体注射到黑猩猩身上时，它能抑制鼻病毒的生长，而在人类身上，它能减轻感冒症状的严重程度和持续时间。
5. Feelings of hopelessness among medieval workers trapped in the poverty cycle gradually lessened as it became possible for women's labor to supplement a family's money income by more than pennies. 受困于贫穷周期的中世纪工人的绝望情绪逐渐减轻，因为妇女的劳动可以为家庭的金钱收入补贴几便士。
