"胎中胎"是个多义词，它可以指寄生胎,胎中胎（轮胎技术）。
他的解释暗含了胎中胎的一些想法，也可以成为“寄生胎”。
His explanation is suggestive of fetus in fetu(fetus within in a fetus), sometimes known as a "parasitic twin".
男女比例落差在四岁以下的人群中达到最大，这意味着“打光棍”（年轻男性找不到配偶并无法繁衍后代）的问题会愈加严重。 而在允许生第二胎（如果第一胎是女孩的话）的省份里，男女比例落差会更大。
The biggest male-female gap is among under-fours, meaning the problem of "bare branches" – young men who can't find partners or have children – is likely to increase.
他们发现，当第一胎是女儿时，第二胎中的女孩跟男孩的出生比例从1990年的906：1000下降到2005年的836：1000 -每年下降0.52%。
They found that the ratio in second births where the first child was a daughter fell from 906 girls per 1,000 boys in 1990 to 836 in 2005 - a drop of 0.52% a year.
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