Concerned conservationists began trying to breed them in captivity in the 1970s, collecting and storing semen from males.

1970 年代，关心的自然资源保护主义者开始尝试圈养它们，收集并储存雄性的精液。

Though scientists had stored semen, they would have to collect the eggs— a complex procedure that requires a female to be sedated for up to two hours.

尽管科学家们已经储存了精液，但他们还必须收集卵子——这是一个复杂的过程，需要女性被镇静长达两个小时。