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1.go-ahead 前进
例句：The more go-ahead cities in China, including Beijing, Shanghai and Guangzhou, have handed some rubbish-disposal contracts to private firms.
更多的走在前列的城市，包括北京上海广州，已经把部分垃圾处理工作承包给私营公司。
2.ahead of 在…之前
例句：The soldiers probed cautiously ahead of them for mines.
士兵们小心翼翼地探测前方的地雷。
3.marine life 海洋生物
例句：We know exactly how long this wreck has been under water and how long marine life has been growing on it.
我们能够确切地知道这些残骸在水中有多长时间,以及海洋生物在其上面生长了多久。
4.coral reef 珊瑚礁
例句：Tetiaroa consists of 13 white sand islets encircled by a coral reef which, from above, appears to shimmer like a turquoise amulet.
罗阿岛由13个被珊瑚礁所环绕的白沙小岛组成，从空中俯瞰，像一个蓝绿色的护身符在闪烁。
