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Water usually freezes when the temperature is _____ zero and

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Water usually freezes when the temperature is _____ zero and ice changes into water again when the
temperature rises_____zero.
为什么是below；above?
under和over分别与它们有什么区别
Water usually freezes when the temperature is _____ zero and
顺便科普一组
below&under：
①低于：under 主要表示垂直在下的正下方,而 below 则不一定表示正下方(即可以是正下方或非正下方).
如：Look in the cupboard below [under] the sink.到洗碗池下面的柜子里找一找.
The climbers stopped 300 meters below the top of the mountain.登山队员们在离山顶 300 米处停了下来.
换句话说,表示正下方,两者都可用；不表示正下方,则通常用below.
②数量的少于：常用under
如：He can’t be much below [under] sixty.他的年龄不可能比 60 岁小很多.
There were under forty people at the meeting.参加会议的人不足 40 人.
It took us under an hour.我们用了不到 1 个小时.
注：在现代英语中,below 表示“少于”,主要用于表示温度、高度以及有纵向标准可比的情况.
如：This place is below sea level.此地在海平面以下.
The temperature is two degrees below zero.温度是零下 2 度.
③若表示一物被另一物所覆盖：常用 under.
如：She crept in beside him under the bedclothes.她钻进被窝躺在他身旁.
④表示职位、级别等关系时,用 under 表直接关系,用 below 表非直接关系.
比较：Mr A is under Mr B.A 先生是 B 先生的部下.
Mr A is below Mr B.A 先生比 B 先生职位低.
再问： 怎么看under怎么像直来直往的"垂直"。。。恩谢谢！！
Water usually freezes when the temperature is _____ zero and Water usually freezes when temperature is _____ zero and ice When the temperature is below zero,the water will f____ . When water is cooled below zero degrees Celsius,it freezes（翻 Water freezes at the temperature of 0 degrees Celsius. Water is_______ if the temperature is above zero.空格应该填什么 "Water becomes ice when it freezes."The teacher told us. it is warmmer than yesterday.the temperature is_____ zero.介词 freeze主动还是用被动?The water is frozen 还是用 the water freezes? Ice turns into water when the temperature is ____ (超过) 0℃ ______ the temperature today?Very _____.it's _____ zero.ther The water is _____.