英语翻译After a long period of studies,scientists are uncovering

英语翻译
After a long period of studies,scientists are uncovering surprising new findings about dolphins.They believe that dolphins do "talk" to each other,whistling "names" among themselves and others in their group.They help one another when in trouble.Like bats,they use sound waves to "see".Because of these and many other findings,many scientists now place dolphins among the cleverest animals on earth.
Dolphins love to mimic.If we swim on our backs,they do too.If we dive,they follow.Once a trainer blew a puff of cigarette smoke against the window of an observation tank,a young dolphin suddenly swam to its mother,nursed a moment,and spit out a cloud of milk.It is even more surprising that dolphins are able to understand sign language.One of Herman's dolphins has mastered more than 50 sign words.For example,it understands the difference between "bring the surfboard to the person" and "bring the person to the surfboard."
Scientists are learning how dolphins "speak" to each other."Each dolphin," says Peter Gyack "has its own 'signature' whistle." Dolphin can also mimic the signature of others.
Dolphins help one another.When birth-giving takes place,females gather to keep off sharks.Later,while the mother looks for food,they take care of the young dolphin,swimming in a circle.
Dolphins reach out to us in astonishing ways.What would the world be like without them?
求以下两句的翻译,尽量精准,
①Once a trainer blew a puff of cigarette smoke against the window of an observation tank,a young dolphin suddenly swam to its mother,nursed a moment,and spit out a cloud of milk.
②When birth-giving takes place,females gather to keep off sharks.Later,while the mother looks for food,they take care of the young dolphin,swimming in a circle.

1、每当驯养员抽香烟时对着观赏水箱的玻璃吐烟雾,一只年幼的海豚就会立即游向母海豚,向妈妈讨口奶,然后向驯养员回喷一串奶泡泡.
2、当有海豚正在生孕小海豚时,其他母海豚会聚集起来不让鲨鱼接近那对母子.之后,每当海豚妈妈外出觅食时,她们又会游成一个圈形,悉心照料小海豚.