1.一道OG12verbal 分册的题目 Schistosomiasis, a disease caused by a parasitic worm, is prevalent in hot, humid climates, and it has become more widespread as irrigation projects have enlarged the habitat of the freshwater snails that are the parasite’s hosts for part of its life circle. 疑问是 这里的代词应该指代snails呢还是parasite呢 涉及到用its 还是their 怎么理解都说的通啊
2. Overlap between the two groups was not calculated until 1890. 这句话的意思是到1890年 overlap 才calculate了? 还是直到1890年也没有计算呢? 关于until的用法。
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