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Every year, some place in the world, an accident involving an airplane occurs. These accidents are painful because of great numbers of passengers that they carry. Although these are few in number, a great, many people die when even one airplane crashes. Even with the problem of terrorism, the chance rate is low for airplane crashes. Statistics show that you are many more times likely to be killed in a car accident than in a plane crash. Thousands of planes fly around the world each minute of every day. Despite this, we rarely hear of air accidents. People use their emotions instead of logic in dealing with the problems of air travel. With the coming of modern emergency measures and air safety, airplane accidents are actually beginning to decline in number. The reasons for airplane accidents are usually because of pilot error. Other problems can come when the plane hits a rocky air stream or rough weather. Regular overhauls of the planes can help to deter many of these mechanical problems. Pilots can also be rotated more to decrease fatigue or other personal hazards. If precautions are taken, many airline incidents could have been avoided.

聽看學

每年，在世界的某些地方都會發生飛行事故。由于飛機承載大量的乘客，所以這些事故讓人痛心。盡管飛行事故數量很少，但即便一架飛機墜毀，就會有很多人喪生。事實上，即便有恐怖主義的問題存在，墜機的幾率還是很低的。統計數據表明，相對于墜機而言，一個人更有可能死于車禍。每天，每分鐘，全世界有數千架飛機在飛行。盡管這樣，我們還是很少聽說空難。人們在對待飛行問題時，往往憑借情感而非邏輯。隨著現代緊急措施和空中安全的應用，飛行事故的數量實際上開始不斷減少。飛行事故通常是由飛行員的錯誤而引起的。其他問題可能是技術上或電力系統的原因，比如導航系統。當飛機遇到波動氣流或壞天氣時也可能出現問題。定期檢查飛機有助于阻止許多技術問題的產生。可以增加飛行員輪流值班的次數以減少疲勞和其他個人危險行為的發生。如果采取了預防措施，許多飛行事故都可以避免。

語法小結 Grammar

時間狀語從句

時間狀語從句是比較常見的一種狀語從句，它可以由when, while, as, before, after, till, until等引導。

1.由when, while, as 引導

When you think you know nothing, then you begin to know something.

當你以為自己一無所知的時候，你就開始知道一些事情了。

Strike while the iron is hot.

趁熱打鐵。

Our teacher laughed as she spoke.

老師邊說邊笑。

注意：when, while 和 as 的區別在于：when 引導的從句的謂語動詞可以是延續性動詞，也可以是瞬時動詞，when 有時表示“就在那時”;while 引導的從句的謂語動詞必須是延續性的，強調主句和從句的動作同時發生，while 有時還可以表示對比;as 表示“一邊……一邊……”，引導延續性的動作，一般用于表示主句和從句動作同時發生。

2.由before和after引導

My father had left for America just before the letter arrived.

我爸爸在到信之前去美國了。

Please let me know after you decide.

你決定后請讓我知道。

3.由till或until引導

I didn’t go to bed until/till I finished my homework.

我作業做完了才睡覺。

It was not until the class was over that he began to teach me English.

直到下課之后他才開始教我英語。

家庭總動員 Do it together

兩人一組，一方朗誦下面的中文句子，另一方說出相對應的英語句子。

1.他走了以后我才知道這件事情。

2.你做完作業以后告訴我。

3.你鎖門的時候注意到了嗎?

4.飯前要洗手。

5.我下車時看到他了。

1.I saw him as I getting off the bus.

2.I didn’t know that until he left.

3.Please wash your hands before eating.

4.Tell me after you finish your homework.

5.Do you notice that when you lock the door?