重點(diǎn)講解：
1. throw out 扔掉，丟掉(廢棄物)；
In just one day, Americans throw out 136 million kilograms of packaging.
僅僅一天，美國人大約扔出一億三千六百萬公斤的成包垃圾r3vGC;cc4Fu!vaBy。
2. be supposed to do sth. (按計(jì)劃或期望)應(yīng)當(dāng)，應(yīng)該，須；
She was not supposed to go but she insisted on going.
不該她去，她偏要去R&5&g8;PRi-7nFyq。
3. err on the side of 寧愿過于…；力求…；
They may be wise to err on the side of caution.
他們過于謹(jǐn)慎也許是明智的-@(7=]MpT;Abv3@i7Pz。
4. go by 遵循；遵照；
You can't go by what he says, he's very untrustworthy.
你不能根據(jù)他的話判斷，他是很不可靠的M5^^,_9Dqyu。