知道某数...

The Indians cut notches on a stick to keep count of numbers.印第安人在棒上刻V形 凹痕用来计数.I've bought so many books this year that I can hardly keep count of them.今年我买了很多很多书,连我自己也不知道到底有多少.Keep count of your return visits to our...

keep count of的音标：keep count of的英式发音音标为：[ki:p kaunt ɔv]keep count of的美式发音音标为：[kip kaʊnt ʌv]...