1.such as 例如；譬如；诸如

例句:Some economists emphasise structural factors such as labour costs.
有些经济学家较为强调人力成本等结构性因素。

2.drop in 愿意参加；顺便拜访

例句:The drop in chinese imports weighed on commodities markets.
中国进口下降对大宗商品市场构成下行压力。

3.even though 即使，纵然

例句:Even though it's like putting your face against a wall.
尽管这像是把你的脸贴着墙壁。

4.lack of 缺乏

例句:Another problem is the lack of good animal models.
另一个难题是缺少良好的动物模型。