S4: How can investors make money?
学4：投资者如何才能赚钱呢？
S4: Could you tell us more in detail?
教4：您能说得再具体些吗？
S4: He can ask the policemen for help.
有困难，找民警，他可以寻求警察的帮助。
Passage 2 S4. Car crashes are the leading cause of injury and death among u.
撞车是造成美国儿童伤亡的第一大杀手。
Passage 2 S4. Car crashes are the leading cause of injury and death among u.
撞车是造成美国儿童伤亡的第一大杀手。
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