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1.such as 例如
例句：Trees such as spruce, pine and oak have been planted.
种植了云杉、松树和橡树等树木
2.hunt for 寻找
例句：Parent birds began to hunt for food for their young.
亲鸟开始为幼鸟寻找食物。
3.refer to 涉及
例句：I mention this point now in passing and shall refer to it again.
这一点现在顺便提一下，以后还会讲到。
4.track down 寻找，追查
例句：She had spent years trying to track down her parents
她已经花了好多年时间试图追寻父母的下落。
