许多科学家认为铅会在土壤和雪中停留更长的时间。
Many scientists had believed that the lead would stay in soil and snow for a longer period.
因此，许多科学家认为，哭泣在某种程度上有助于我们处理情感问题。
Many scientists, therefore, believe that crying somehow helps us cope with emotional situations.
许多科学家认为，由于气候变化，太平洋变暖引起的厄尔尼诺现象正愈演愈烈。
Many scientists believe that El Nino events, caused by warming in the Pacific, are becoming more intense as a result of climate change.
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