He had no mysticism about turtles although he had gone in turtle boats for many years.

Seals, turtles and penguins have flippers.

海豹 、 海龟、企鹅均有鳍状肢.

Turtles like to bask in the sun.

海龟喜欢曝于阳光中.

A turtle lays many eggs at once.

海龟一次下许多蛋.

It is plainly cruel to keep turtles as pets.

显然，养海龟作宠物十分残忍。

He ate the white eggs to give himself strength.

他吃白色的海龟蛋,为了使身子长力气.

If you turn over a turtle on its back, it will become helpless.

假如你把海龟翻过来, 它就无能为力了.

Whales, seals, penguins, and turtles have flippers.

鲸 、 海豹, 企鹅和海龟均有鳍形肢.

Air pollution control will be expensive.

控制空气污染是要费钱的.

The air pollution has become a big problem.

空气污染已成为大问题.

Air pollution is a global problem.

空气污染是全球性的问题.

Air pollution contributes to respiratory diseases.

空气污染可促使呼吸系统疾病发生.

The use of such technique could result in air pollution.

使用这种技术会造成空气污染.

Exhaust gas has been incriminated in air pollution in cities.

废气已被视为城市空气污染的原因.

We are taking steps to prevent air pollution and stream pollution.

我们正在采取步骤防止空气污染和河流污染.

Knowledge of any given exposure to air pollutant mixtures is largely inadequate.

关于任何特定的暴露于空气污染混合物中的知识,都是极为欠缺的.

We shall take a series of measures to stop air pollution.

我们将采取一系列措施制止空气污染.

We must do a good job in controlling the air pollution.

我们必须搞好控制空气污染的工作.

The concern of this book is with air pollution.

本书的重点是论述空气污染.

British universities have very little wastage and their graduates are good.

英国大学的退学率很低，而且他们的毕业生很优秀。

He is one of the best players in the world.

他是世界上最优秀的选手之一。