作为海洋中最大的生物,蓝鲸很难追踪,但由于商业捕鲸,它们几乎灭绝,现在已被列为濒危物种。
It is hard to track the blue whale, the ocean's largest creature, which has almost been killed off by commercial whaling and is now listed as an endangered species.
这种物质已被列为毒物。
这地方已被列为世界联合科教文的世界遗产之中。
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