这个部落人的平均寿命是40岁。 The average life expectancy of the people in this tribe is 40 years Collocations low 预期寿命短 high life expectancy 预期寿命长 a life expectancy of50 years预期寿命50年 4)(L5 soar: vi. rise rapidly or to a very high level Unexpectedly the jet crashed shortly after it soared into the air. Industrial unemployment has soared to 40%, which is threatening the social stability. 5) L5)boom: n. a(period of) rapid growth or increase This country's economy development has contributed a lot to the boom in world trade 我们必须要意识到90年代的经济繁荣已经结束了 ( We have to realize that the economic boom in 90s is over now 6)(L10)entertainment: n. sth, esp. a public performance, that amuses Las vegas is one of the biggest entertainment centers in the Us (Our agency supplies live entertainment for private or corporation parties. 适当的娱乐对于情感和心理的健康是必要的。 (Appropriate entertainment is necessary for emotional and psychological health 7) L.16)formal: a suitable for official occasions, serious writing, etc. but not for ordinary conversation We should be formal on business occasions, and never call anyone by their first name.我们在商务场合应该讲究礼仪,不要对别人直呼其名。 (You shouldnt use" Yours faithfully"- it's much too formal for this kind of letter.5 这个部落人的平均寿命是 40 岁。 (= The average life expectancy of the people in this tribe is 40 years.) Collocations: low life expectancy 预期寿命短 high life expectancy 预期寿命长 a life expectancy of 50 years 预期寿命 50 年 4) (L.5) soar: vi. rise rapidly or to a very high level *Unexpectedly the jet crashed shortly after it soared into the air. (=Industrial unemployment has soared to 40%, which is threatening the social stability.) 5) (L.5) boom: n. a (period of) rapid growth or increase * This country's economy development has contributed a lot to the boom in world trade. 我们必须要意识到 90 年代的经济繁荣已经结束了。 (=We have to realize that the economic boom in 90s is over now.) 6) (L.10) entertainment: n. sth., esp. a public performance, that amuses *Las Vegas is one of the biggest entertainment centers in the US. (=Our agency supplies live entertainment for private or corporation parties.) 适当的娱乐对于情感和心理的健康是必要的。 (=Appropriate entertainment is necessary for emotional and psychological health.) 7) (L. 16) formal: a. suitable for official occasions, serious writing, etc. but not for ordinary conversation We should be formal on business occasions, and never call anyone by their first name. 我们在商务场合应该讲究礼仪, 不要对别人直呼其名。 (=You shouldn't use "Yours faithfully" — it's much too formal for this kind of letter. )