At present the number of the giant lizard is getting fewer and fewer in the world. It is unknown that how many giant lizards of this kind have been alive.

目前世界上的巨蜥数量越来越少，这种巨蜥究竟有多少存活尚不清楚。

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At present the number of the giant lizard is getting fewer and fewer in the world.It is unknown that how many giant lizards of this kind have been alive.

目前世界上的巨蜥数量越来越少，这种巨蜥究竟有多少存活尚不清楚。

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And others believed that snakes evolved from the mosasaurs, giant swimming lizards that lived 144 to 65 million years ago.

另一些科学家认为蛇由沧龙进化而来，沧龙是生活在一亿四千四百万年前至六千五百万年前的一种巨型水生蜥蜴。

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But the giant lizards were already in trouble when the impact came.

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