1.such as 例如
例句:Trees such as spruce, pine and oak have been planted.
種植了云杉、松樹和橡樹等樹木
2.hunt for 尋找
例句:Parent birds began to hunt for food for their young.
親鳥開始為幼鳥尋找食物 。
3.refer to 涉及
例句:I mention this point now in passing and shall refer to it again.
這一點現在順便提一下,以后還會講到 。
4.track down 尋找,追查
例句:She had spent years trying to track down her parents
她已經花了好多年時間試圖追尋父母的下落 。