eighty meters high与eighty- meter-high

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• eighty meters high与eighty- meter-high
• weigh与weight 请大家看几个句子：1.It is 79 meters high and weighs 13.5 tons.(英语书）2.It is 46 meters high and weighs 229 tons.(英语书）3.The car weights about two tons.(英语练习册）4.The fish weights over 5 kilos.（英语练习册）为什么前两个句子与后两个句子,前两个用动词weigh,而后两个用名词weight 呢,是英语书有问题还是英语练习册有问题呢,还是我理解错了?
• eighty meters high与eighty- meter-high
• the 110 meter hurdles 和the 110-meter hurdles 哪个对?为什么加/不加连字符?
• the grass is eaten to less than five centimeters.to在这里是什么意思,Farmers can start rotational grazing by removing animals from a pasture when the grass is eaten to less than five centimeters.to在这里是什么意思,