thirty seconds代表多长时间?

thirty seconds代表多长时间? 请问in+时间长度（如thirty seconds）到底是什么意思? 美国国债用 dollar 或者 thirty-seconds of a dollar表示,请问thirty-secoonds of a dollar 是什么? There are ( ) in an hour a.sixty seconds b.thirty mintues c.sixty minutes thirty in the U.S.a violent crime is committed every thirty-one seconds我想问问我句话什么意思? all the ways man made to keep the city safe were gone in the thirty seconds the earth moved. 下载时s代表多长时间 上1a 代表多长时间 英语翻译Treasury bond prices in the United States are quoted in dollars and thirty-seconds of a dollar.还有金融里day count conventions是什么意思. I was March the----he came here last yeara thirty first that b.thirty-one that c.thirty first when D.thirty -one when2.In our student---of the students are boysa.five-seconds b.fifth-second c.second-fifth d.two-fifths 在太空一天代表地球多长时间 土壤学中10d是什么意思,代表多长时间? 工程上一个d 代表多长时间啊? 一寸光阴一寸金的一寸光阴代表多长时间 一寸光阴一寸金的一寸光阴代表多长时间 All of the ways man had made to keep the city safe were gone in the thirty seconds the earth moved.这里的the earth moved 是什么用法?如果是定语的修饰seconds的话seconds在从句中并不是做宾语的,应该是做时间状语的呀. ten seconds