Tfr
[醫][=total fertility rate]總生育率
??? 情景例句
How is your tennis coming along?
你的網球打得怎么樣？
It is a good horse that never stumbles.
良馬不失蹄。
If you touch them you may break something or have an accident and hurt yourselves.
如果你用手摸它們，也許你會搞壞機器，或者會發生事故，打傷你自己。