For example, if a student smiles at Bill, he responds by smiling back.
例如，如果一个学生对比尔微笑，他也以微笑回应。
How much wood would a woodchuck chuck if a woodchuck could chuck wood?
如果土拨鼠会扔木头，一只土拨鼠能扔多少木头?
Sprinkler systems must be installed if a company employs more than 25 people.
如果公司雇员超过25人，就要必须安装自动喷水灭火系统。
Tickets were $40 to $60 if a guest wanted wine and a "VIP seat" near the stage.
如果客人想要葡萄酒和靠近舞台的“VIP座位”，票价为40至60美元。
He was at once furious and slightly pleased, if a person could be both at one time.
他既生气又有点高兴，如果一个人能同时拥有这两种情绪的话。
Thousands of deaths and other casualties are expected if a 9.0 earthquake were to occur.
如果发生9.0级地震，预计将有数千人死亡和其他伤亡。
Right, bigger frogs have deeper voices, so if a smaller frog can imitate that deep voice.
是的，大青蛙的声音更低沉，所以如果小青蛙能模仿那种低沉的声音。
A tenant may have a right of first refusal if a property is offered for sale.
如果房产要出售，房客可以有优先购买权。
Users need to find out if a domain name is already registered or is still available.
用户需要查明某个域名是已经被注册过还是仍然可用。
If a spacecraft travels faster than 11 km a second, it escapes the Earth's gravitational pull.
如果一架宇宙飞船飞行超过每秒11公里，它就能摆脱地球引力。
If a tranquilizer is prescribed, be sure your physician informs you of its possible side effects, such as addiction.
如果开了镇静剂，一定要让医生告诉你它可能带来的副作用，例如上瘾。
What if a garden is built in the school?
如果在学校里建一个花园，将会怎么样呢？
What happens if a cuttlefish meets its enemy?
如果墨鱼遇到它的敌人会怎样？
If a thin person eats a lot, I'll follow suit.
如果一个瘦的人吃很多，我就会跟着吃很多。
If a small thing goes into your eye, don't rub it.
如果一个小东西进了你的眼睛，不要揉它。
If a car hits you, you should remember the car number.
如果你被车撞了，你应该记住车牌号。
If a spider spreads its web, the sun will shine tomorrow.
蜘蛛张了网，必定大太阳。
If a student makes a mistake, he can just remove or cut it.
如果学生不小心出了错，他就可以删除或剪切掉错误的地方。
If a man felt lonely, he used more words to show his fears.
如果一个人感到孤独，他会用更多的语言来表达他的恐惧。
If a tornado gets close, what should people do to keep safe?
如果龙卷风要来了，人们应该做些什么来保证安全？
If a class is graded on a curve, cheating hurts others' grades.
如果一个班级是按照正态评分的，作弊会影响其他人的成绩。
If a gym isn't your scene, try bowling or an indoor climbing wall.
如果你不喜欢去健身房，试试打保龄球或室内攀岩。
If a person is hit by lightning, you should call for emergency help.
如果有人被闪电击中，你应该呼叫紧急救援。
What should children do if a stranger calls while the parents are out?
父母不在家时，如果陌生人打来电话，孩子应该怎么做？
If a family member or a pet is caught inside, you shouldn't go back in.
如果家庭成员或宠物被困在里面，你不应该再进去。
If a singer coughs, this can result in the bruising of the vocal cords.
如果歌手咳嗽，这可能会导致声带瘀伤。
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