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重點講解：
1. be responsible for 負有責任的；應承擔責任的；
The sun's ultraviolet rays are responsible for both tanning and burning.
陽光中的紫外線是皮膚曬黑和灼傷的根源。
2. find out (尤指特意通過努力)發(fā)現(xiàn)，找出，查明；
They had their tablets analysed to find out whether they were getting the real drug or not.
他們將藥片拿去化驗以查明他們得到的是否是真藥。
3. break up 散（會）；（使）解散；
Police used tear gas to break up a demonstration.
警察使用催淚瓦斯驅散示威人群。
4. return to 恢復，回到(原來的狀態(tài))；
Bank of England officials continued to insist that the pound would soon return to stability but disaster struck.
英格蘭銀行官員仍然堅持說英鎊不久就會恢復穩(wěn)定，但結果災難爆發(fā)了。
