每日口說挑戰 天啊！世界上的男生比女生多的原因竟然是...Why Do We Have More Boys Than Girls?

今日挑戰句子

Somehow, female biology suppresses boy's survival in the womb during tough times, and boosts it when times are good. We've seen the same pattern in other mammals too.

不知何故，母體在環境艱困時會抑制男孩在子宮內存活，在環境好時則相反。其它哺乳類動物也有相同的情況。