If not, we couldn't put money in the bank, buy food, clothing, or medicine from others, drive across a bridge, get on a plane—the list is endless.
如果不是，我们就不能把钱存入银行；不能从别人那里购买食物、衣服或药品；不能开车过桥，不能坐飞机——这样的事情不胜枚举。
If we are not aware of and sensitive to cultural differences, the possibilities for miscommunication and conflict are enormous.
如果我们没有意识到文化差异的存在，或是对文化差异不敏感，那么误解和冲突发生的可能性是极大的。
If we value something not as a means to something else, but for its own sake, let us say that it has "intrinsic value".
如果我们重视某物不是因为把它看作达成其他目标的手段，而是因为它本身，我们就说它有“内在价值”。
If we are well trained, the underwater part of things is not really as harsh as you might think.
如果我们受到良好的训练，水下部分的事情可能就不会真的像你想像的那么严酷。
If that worked, we should say hooray! If not, we will soldier on to the next step.
如果成功了，我们应该说万岁！如果没有，我们将坚持到下一步。
I will, if it's where we can blaze our way to it and not get lost.
只要我们能标记好一条通往那里的路，而且不迷路，我会的。
"If you see us," Velez tells them, "don't hide! We are not monsters."
“如果你看到我们，”维勒兹告诉他们，“不要躲起来！我们不是怪物。”
This is not to say that we would not have been compatible if we had first met in our freshman year.
这并不是说，如果我们在大一第一次见面，我们就会合不来。
If we fool ourselves into believing we're not doing anything wrong, we can't see the real choice we're making—and that leads to bad decisions.
如果我们继续自欺欺人，认为自己没有做错事，那么我们就无法意识到自己正在做出的真正选择，这会导致进一步做出错误的决定。
We guarantee to refund your money if you're not delighted with your purchase.
如果你对购买的商品不满意，我们保证退款。
We saw his dependency on his mother and worried that he might not survive long if anything happened to her.
我们看到他对母亲的依赖，担心万一她有个闪失，他也会活不长。
On the one hand, if the body doesn't have enough cholesterol, we would not be able to survive. On the other hand, if the body has too much cholesterol, the excess begins to line the arteries.
一方面，如果身体没有足够的胆固醇，我们将无法生存；另一方面，如果体内胆固醇过多，多余的胆固醇就开始让动脉变厚。
"These are very tough times for hardworking families, but the toll would be far worse if we had not acted," he said.
“这对于努力工作的家庭来讲是艰难时期，但如果我们不行动，代价会更大。”他说。
"If we are designing for engineers, I'm not talking about a 'game' at all," Cornetti says.
“如果我们是在为工程师们设计，那我根本就不会提到‘游戏’。”科内蒂说道。
If we know around how old the Basin is, I'm not sure that's reason enough to go to the Moon again.
如果我们知道盆地的年龄，我不确定这是否足以成为再次登月的理由。
Even if we have time, not many of us take the effort to collect and record the recipes from our grandmothers and parents.
即使我们有时间，也没有多少人会花精力去收集和记录我们祖母和父母的食谱。
If we're not engaged as much in our normal work or school, we have extra time to call parents and grandparents.
如果我们没有忙于日常工作和学业，我们将有额外的时间给父母和祖父母打电话问候一下。
The doctors are not entirely sympathetic, "If there was a surgery to enlarge brains, we would offer him a free trial," they quip.
医生们并不太同情，他们讽刺说：“如果有个手术能使大脑变大的话，我们很愿意给他免费试用。”
No language is perfect, and if we admit this truth, we must also admit that it is not unreasonable to investigate the relative merits of different languages or of different details in languages.
没有一种语言是完美的，如果我们承认这一点，我们也必须承认，研究不同语言或语言中不同细节的相对优点并不是没有道理的。
Water shortages do not have to trouble the world — if we start valuing water more than we have in the past.
如果我们开始比过去更加重视水的价值，水资源短缺就不会给世界带来麻烦。
If not, we surely must find the owner, for he will certainly miss it.
否则，我们一定要找到它的主人，因为他一定会找不到它的。
Which one is not proper if we succeed?
如果我们取得成功的话，下列哪一种做法是不合适的？
If we do not study hard, sooner or later, we will fall behind the other students.
如果我们不努力学习，我们迟早会落后于其他同学。
If we do not drink enough water, we can get headaches, stomachaches and our kidneys will not work normally.
如果我们没有喝足够的水，我们会头痛，胃痛，肾脏也将不能正常工作。
"If we are not able to make her live longer, we can make her life wider," said Xu's father.
“如果我们不能延长她的生命，那我们可以让她的生命更加充实。”徐的父亲说。
We will not check if you eat the fruit on an empty stomach.
我们不会检查你是否空腹吃水果。
If a change does not affect the food's chemical composition, we call it a physical change.
如果一种变化不影响食物的化学成分，那我们便称之为物理变化。
We can not see which way to go if the stars do not twinkle so.
如果星星不这样闪烁，我们就看不见该走哪条路。
If we as a people and as a country do not even understand our traditional clothing or don't wear them, how can we talk about other important parts of our culture?
如果我们作为一个民族、一个国家，甚至不了解我们的传统服饰，或者不去穿它们，我们怎么能谈论我们文化的其他重要部分呢？
Not only should we try to learn from it if we want to succeed, we must also be persistent.
如果我们想要获得成功，不仅要努力从中学习，还要坚持不懈。
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