Infant mortality is a highly sensitive barometer of socio-economic conditions.
婴儿死亡率能反映社会经济状况。
Infant mortality is a highly sensitive barometer of socio-economic conditions.
婴儿死亡率能反映社会经济状况。
Infant mortality has been dramatically reduced because of modern medicine.
由于现代学婴儿死亡率已经极大地降。
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