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重点讲解：
1. account for （数量或比例上）占；
Computers account for 5% of the country's commercial electricity consumption.
计算机占去该国商业用电的5%。
2. convert into (使)改变；更改；(使)转变；
The signal will be converted into digital code.
信号会被转变为数字代码。
3. transform into 转换；改变；改造；
Your metabolic rate is the speed at which your body transforms food into energy.
新陈代谢率是身体把食物转换为能量的速度。
4. warm up 使暖和；变暖和；
The weather had warmed up.
天气已经转暖。
v. 变换，(使)转变，使 ... 改变信仰，倒置，兑换
