That human beings rationally decide what their self-advantage is.
人类理性地判断自身利益之所在。
Selfing progeny of E. urophylla showed depression in general, but some other combinations showed self-advantage.
尾叶桉自交后代普遍存在衰退现象,但亦有个别组合表现出一定的自交优势。
The advantage of independent education is that it is self-paced and can be attended when you have time.
独立式教育的优点是,可以自我调节进度,并且可以在有时间的时候参加。
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