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Scattered through the seas of the world are billions of tons of small plants and animals called plankton. Most of these plants and animals are too small for the human eye to see. They drift about lazi
33 Plankton浮游生物. Scattered through the seas of the world are billions of tons of small plants and animals called plankton. Most of these plants and animals are too small for the human eye to see. They drift about lazily with the currents, provid
Scattered through the seas of the world are billions of tons of small plants and animals called plankton. Most of these plants and animals are too small for the human eye to see. They drift about lazi
Scattered through the seas of the world are billions of tons of small plants and animals called plankton. Most of these plants and animals are too small for the human eye to see. They drift about lazily with the currents, providing a basic food for m
今天要学的一个词是:pump。pump,Pump一般是指泵,或抽水机。可是今天讲的pump是指汽车加油站的泵。英国石油公司宣布停止在阿拉斯加的石油开采,《洛杉矶时报》的标题说:Oilfield Closure t
今天要学的一个词是:pump。pump,Pump一般是指泵,或抽水机。可是今天讲的pump是指汽车加油站的泵。英国石油公司宣布停止在阿拉斯加的石油开采,《洛杉矶时报》的标题说:Oilfield Closure t