it's about three hundreds metres long on the left

It's three metres long by two metres wide..这里By是什么意思. 关于英语数词的题目It's about ( )awayA.a hundered of metres B.hundreds It's about 29 metres long and o________ 9 floors high It's about three feet long and two feet It's on the left.翻译 The Three Gorges Dam in Hubei is （）metres long “The bridge is over three metres long”.的同义句? it is about twenty meters along on the left The Changjiang River is about 6700 metres long.(同义句) The big fish is about two metres long The ole tower looks nice.It's about twelve metres high. how big is your____room?.it's about 20 square metres.