X megawatt-hours of Y
X为数字，Y为能源或电量。
The plant generates 500 megawatt-hours of electricity daily.
该电厂每天发电500兆瓦时。
兆瓦时
能量单位,等于1兆瓦功率作用1小时所提供的能量(3.6×109焦耳)。；百万瓦时
a unit of energy equivalent to one megawatt of power used for one hour (3.6×10^9 joules).
能量单位,等于1兆瓦功率作用1小时所提供的能量(3.6×109焦耳)。
A unit of energy equal to that provided by one megawatt acting for one hour (3·6 × 109 joules).
Our solar panels generated 5 megawatt-hours of electricity last month.
上个月我们的太阳能电池板发电量为5百万瓦时。
用法提示：用作电能量单位，表示发电量。
The new battery system can store up to 10 megawatt-hours of energy.
新电池系统最多可储存10百万瓦时的能量。
用法提示：用作电能量单位，表示储能容量。
A typical household consumes about 0.01 megawatt-hours of electricity per day.
一个典型家庭每天大约消耗0.01百万瓦时的电力。
用法提示：用作电能量单位，表示用电量。
X为数字，Y为能源或电量。
The plant generates 500 megawatt-hours of electricity daily.
该电厂每天发电500兆瓦时。
用作定语修饰名词，表示该名词的容量或功率。
The megawatt-hour capacity of the battery is 200.
电池的兆瓦时容量为200。
用于表示每单位能量的价格或效率。
The cost per megawatt-hour has decreased.
每兆瓦时成本已下降。
grammar · medium
易错句子The battery stores 2 megawatts-hour.
正确表达The battery stores 2 megawatt-hours.
错误地将复合名词的第一部分复数化。'megawatt-hour' 是一个复合名词，其复数形式应加在第二部分上，即 'megawatt-hours'，而不是改变第一部分。
grammar · medium
易错句子It produces 100 megawatt hours annually.
正确表达It produces 100 megawatt-hours annually.
缺少连字符。在复合名词 'megawatt-hour' 中，连字符连接两部分，表示一个单位。去掉连字符可能导致歧义或不符合标准用法。
两者都是能量单位，但数量级不同：1 megawatt-hour = 1000 kilowatt-hours，使用时需注意换算。
megawatt是功率单位（瞬时功率），而megawatt-hour是能量单位（一段时间消耗的总能量），不可混用。
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