Mechanic: I understand your inconvenience, but you haven't made an appointment earlier. I won't be free till tomorrow afternoon. How about 4 p. m.?

技工：我能理解您的不便，可您没有早点儿和我预约呀。我要一直忙到明天下午。明天下午4点上您家，可以吗？

youdao

The reactive species, which may be a free-radical, adds to a monomer molecule by opening the p-bond to form a new radical.

这个带有自由基的反应种通过打开双键加入到单体分子上，从而形成新的自由基。

youdao