sound travels at 340 meters per second in air.travels 为什么用at?

sound travels at 340 meters per second in air.travels 为什么用at? we know sound travels very sound travels more slowly than 八下 英语 选词填空before,discover,fast,in,come,watch,so,fast,it,ago,shine,not canLight travels at a speed which is about a million times ( ) than that of sound.( ) one second,lidht travels about 300,000 kilomemters,but sound traves only 340 m 英语翻译Light trave at a fast speed.It is about a million times faster than sound.In one second,Iight travels about 300,000 kilometres,but sound travels only 340 metres.You may have some knowledge of this difference by watching the start of a run light travels at a speed which is about a million times faster than the speed of sound Light travels much faster than sound.rt Light travels move quickly than sound? Light travels faster than sound改为过去式 sound travels through air的中文意思 根据句意及所给首字母提示完成句中所缺的单词1.With tears in her eyes,she was u____ to say a word.2.Sound travels at the s____ of 340 metres a second. light travels faster than sound的同意句sound travels _ _ than light.两个空 选词填空 light travels at a spend which is about a选词填空 light travels at a spend which is about a million times_1than that of sound Light travels at a speed which is about a million times faster than the speed of sound.In one second,light travels about 300,000km.But sound travels only 344m.You can get some idea of this difference by watching the start of a race.If you stand some light travels at a speed which is about a million times faster than that of sound.a million times faster是一百万倍的速度吗?举例 英语翻译Tom at once answered,"Your brother.Because electricity travels faster than sound waves.""That's very good." light travels about a million times faster than sound翻译 怎么把Light travels faster than sound.改成一般疑问句