这就要求必须有劳动和时间密集的孕育和抚养过程使克隆婴儿长大成人.

These require the labor - and time - intensive processes of gestation and child rearing to reach adulthood.

尽管如此，心理学家们也调查了一些时间密集性较低的培训选择，幸运的是，这对我们所有人来说，在职实践似乎确实有帮助。

Still, psychologists have investigated less time-intensive training options, too, and thankfully for all of us, on-the-job practice does seem to help.