求翻译：鲸的繁殖能力很差，平均两年才生下一头幼鲸。由于人类的捕杀和环境的污染，鲸的数量已经剧烈减少。如，在20世纪的蓝鲸，有近37万头被杀戮，目前仅存不到50头。在地球上生活了5000多万年的鲸，许多种类已经濒临灭绝。是什么意思？

Poor reproductive capacity of the whales, an average of two years before giving birth to a baby whale. Due to human hunting and environmental pollution, the number of whales has been a sharp reduction. For example, in the 20th century, the blue whale, nearly 370,000 have been killed, there are fewer

Whale's breeding ability is very poor, an average of two years after the birth, a young whale head. Because of human hunting and of the environment, the whale has been drastically reduced in number. In the 20th century, the blue whale, and nearly 370,000 were killed, there is only less than 50 head.

Whale's reproduction ability is very bad, the average two years only then give birth to a young whale.Because humanity's capturing and killing with the environment pollution, whale's quantity already was fierce reduces.Like, in 20th century blue whales, has near 370,000 to slaughter, at present only

Whale reproduction is very poor on average two years gave birth to a Cub. Due to human hunting and pollution of the environment, the whale had a dramatic reduction in the amount of. If, in the blue whales of the 20th century, nearly 370,000 have been killed, now only less than 50 head. Whales of the

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