请问in+时间长度（如thirty seconds）到底是什么意思?

请问in+时间长度（如thirty seconds）到底是什么意思? in fifteen thirty-four 是 at thirty six 还是in thirty six SE字母得到一列数据后算出其平均数后,在在其后加减SE,后面还有一个字母,如1.355+-0.325a 或 4.256+-0.654b请问是什么意思 请问如何以长度计算卷径 法语 se sent的用法及过去分词的作用请问se sent后接名词表示感觉像...,如se sent roi感觉像国王?其后接过去分词,过去分词可以充当形容词? thirty How long does it take?提问,为什么能用thirty minute's walk 回答?how long提问，不是只能回答时间或长度吗？不要翻译 There are( )days in January.A:thirty B:thirty-first C:thirty-one 请问on,in,at用于时间上的区别?如：在“十月”前面用in还是on? 请问he actually gained thirty pounds in a month- partly at an Arizona dude ranch.这句话怎么翻译啊 请问同步带轮T形齿中SE br N br SE hg N hg 的SE N six, is, morning, it, the, in, thirty there are thirty-five students in my it ------- five thirty in the afternoon填空 Are there thirty-one days in April? in thirty minutes 是什么意 急 thirty minutes和thirty-minute的区别是什么CCTV is the biggest television station in China.Its _____evening news.A.thirty minute B.thirty minutes C.thirty-minute