今日挑戰句子
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The US has one of the best, most reliable power grids in the world, so people aren't saying 'let's knock out this entire grid.' You could just have one converter box in your house, and that way you're not converting AC to DC at the level of every single device.
美國擁有世界上最好、最可靠的發電系統，所以人們不會想要把它們砍掉重練。只要在家家戶戶都安裝一個轉換器，這樣你就不需要替你的所有電子產品做交流電和直流電的轉換。
學習重點
3. knock out 一拳擊昏某人; 打敗; 淘汰
knock out
(ph.) 一拳擊昏某人; 打敗; 淘汰
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