I am sure you all know from physics class about how light moves in microscopic ways and that we can only see light when the wavelength of that light is in a specific range.
我相信，你们在物理课上都学过光是如何以微观的方式运动的，以及只有在光的波长在特定的范围内时我们才能看到光这一事实。
Only when we're polite to others, can we maintain a pleasant relationship with them.
只有当我们待人礼貌时，我们才能和他人维持愉快的关系。
Only when we react to emergencies in life calmly, can we solve problems in a better way.
只有当我们冷静应对紧急状况时，我们才能更好地解决问题。
Only when advanced countries extend a helping hand to developing countries, can the world be a better place.
只有当先进国家向发展中国家伸出援助之手时，世界才能变得更好。
Only when all of us join efforts to eliminate pollution at all levels can we expect to have a better environment.
只有当我们所有人共同努力消除各种污染时，我们才能期望有一个更好的环境。
Only when all of us join hand in hand to eliminate noise pollution at all levels, can we have a better environment and a more beautiful future.
只有当我们所有人携手消除各级噪音污染时，我们才能拥有更好的环境和更美好的未来。
Only when everyone strive for their own dreams can we realize the Chinese Dream.
只有当每个人为了自己的梦想而奋斗的时候，我们才能实现中国梦。
Only then can they hope to describe conditions at the Big Bang, when all space and time was compressed into a volume far smaller than a proton.
只有那样他们才能指望描述大爆炸的情况，所有的空间和时间全部在那时被压缩成一个远小于质子的体积。
You can have courage only when you know where your goal is.
只有当你知道你的目标在哪里时，你才会有勇气。
Only when we make full preparations for every coming opportunities, can we succeed one day.
只有当我们为每一个即将到来的机会做好充分的准备时，我们才能在某一天获得成功。
They can only be believed when they are repeated.
它们只有被重复才能被相信。
Sunday is the only day when I can relax.
星期日是我唯一可以休息的日子。
The only time I can think clearly is when I'm alone.
我能清醒思考的惟一时间就是当我独处时。
You cannot live your children's lives for them; you can only be there to pick up the pieces when things go wrong.
你不能替孩子过活，只能在出现问题时帮忙解决。
He can be very helpful, but only when it suits him.
有时候他非常肯帮忙，不过那得他觉得合适。
The total amount of damage to Notre Dame Cathedral can be assessed only when its structure is considered safe.
只有在巴黎圣母院结构安全的情况下才能评估其损失总额。
Based on excavations, we can know the layout of the houses and the location of the graves, but we're only guessing when we tried to say why they did it that way.
根据挖掘的情况，我们可以知道房子的布局和坟墓的位置，但是我们试图解释他们这样做的原因时只是瞎猜而已。
Many youths can only get through by borrowing money, and it means they have to earn more money when they graduate.
许多年轻人只能通过借钱来度过难关，这意味着他们毕业后必须赚更多的钱。
When Hobbes tells that story, one can only imagine he must have had a kind of wry grin on his face when he wrote that out.
当霍布斯讲这个故事的时候，我们可以想象当他写出来的时候，他脸上呈现的会是怎样的苦笑。
Some people think drones can only be used by governments to help when needed.
一些人认为只能由政府在需要的时候使用无人机提供帮助。
At mid-century, an Antwerp financier only slightly exaggerated when he claimed, "One can no more trade without bills of an exchange than sail without water."
在这个世纪中叶，一位安特卫普的金融家略微夸张地说道：“没有汇票就不能交易，正如没有水就不能航行一样。”
Ideas can only be remembered when they are repeated.
观点只有被重复才能被记住。
Only when we follow the laws of nature, can we better get along with it.
我们只有遵循自然法则才能更好地与环境和谐共处。
"Only when the Tooth Fairy buys the lost tooth from us, can we grow a new tooth." Logan nodded.
“只有牙仙把掉的牙买回来，我们才能长出一颗新牙。”洛根点了点头。
Only when combined with targets, can great efforts help people realize their full potential.
只有与目标相结合，努力才能帮助人们发挥其最大潜能。
We can't appreciate these kinds of details without seeing works of art as they originally appeared—something Smith believes you can do only when you have a road map.
在没有看到艺术品最初的样子时，我们根本无法欣赏到这些细节。而史密斯认为，只有当你拥有成品的路线图了，你才能领会到这些细节的美。
They can only land once—the time when they die.
它们只能落地一次——那就是死亡的时候。
I only care when it can be done.
我只关心它什么时候能完成。
Maybe the story is telling us if we don't look after the planet, a day will come when flowers can only grow on the moon.
也许这个故事告诉我们，如果我们不爱护这个星球，总有一天，花就只能在月球上生长。
Maybe the story is telling us if we don't look after the planet, a day will come when flowers can only grow on the moon.
也许这个故事告诉我们，如果我们不爱护这个星球，总有一天，花就只能在月球上生长。
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