In celebration of his 80th birthday in 1791, the emperorQianlong had a number of seals made, of which this is one of thebiggest on record.
据传在1791年，为庆祝自己的80寿辰，乾隆帝命人制作了一批玉玺，而这枚是所有记录在册的玉玺中最大的。
An alarming number of Mediterranean monk seals, an endangered species, have recently died.
最近，濒临灭绝的地中海僧海豹出现了惊人数量的死亡。
They have pushed down the number of polar bears and seals while polar bears depend on sea ice for hunting seals.
它们导致了北极熊和海豹数量的减少，而北极熊依靠海冰捕食海豹。
Walters said that in the isolated northwest Hawaiian islands, the number of monk seals is declining by four percent every year.
沃尔特斯表示，在夏威夷西北部孤立的海岛，僧海豹数量每年都在减少4%。
When SEALs are not on acutal combat deployments, they are spending the vast majority of their time training for a number of different types of missions.
没有实际作战任务时，海豹突击队员们会拿出大部分时间，针对各种不同的任务进行训练。
Here you will see albatrosses, seals, penguins, and a number of other interesting representatives of the Antarctic region.
在这里，你可有看到信天翁、海豹、企鹅以及其他很多种南极地区有趣的代表性动物。
When out of the water, Arctic seals are in danger of being eaten by the region's number one killer-the polar bear.
一旦离开了水，北极海豹就面临着被区域头号杀手——北极熊吃掉的危险。
When out of the water, Arctic seals are in danger of being eaten by the region's number one killer-the polar bear.
一旦离开了水，北极海豹就面临着被区域头号杀手——北极熊吃掉的危险。
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