... Gutman admits that forced separation by sale was frequent，he shows that the slaves’preference，revealed most clearly on plantations where sale was infrequent，was very much for stable monogamy.请问老师，revealed most clearly on plantations where sale was infrequent，书上说这句是...
She looked just the person forthem, though, with her big strong hands and feet; and, judging by her downcast eyes and silence, she was a good worker who would know her place还有就是这里的judging不应该换成过去分词吗？这句话的with 是做表原因的状语吗，这和换成with ...
It's a four-hour flight form phoenix to seattle, another hour in a small plane up to Port Angeles,and then an hour drive back down toForks.感觉上a four-hour flight、another hour、an hour drive是三个并列的表语，有迷惑性的是an hour drive back down toForks的drive是动词往...
That smartphone sales have peaked, and seem to be levelling off at around 1.4bn units a year, is good news for humanity. 这里的 a year是做定语修饰around 1.4bn units吗？感觉不是修饰谓语动词 level off 的。