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Take their tour schedule Watch out for the tr Wear comfortable shoe.
Meet the speaker. Go to their rooms. Change some money.
They need more work experience The salary is usually good Their choice is limited.
v sin θ v cos θ 
小于第一宇宙速度
介于第一宇宙速度和第二宇宙速度之间
介于第二宇宙速度和第三宇宙速度之间
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A student An employer An engineer
It’s unpredictable It’s quite stable It’s not optimistic
On September 15 On September 16 On September 23
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介于第一宇宙速度和第二宇宙速度之间
介于第二宇宙速度和第三宇宙速度之间
大于第三宇宙速度
In a park. In a hotel. In a shopping centre.
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