I think we must do something to protect the environment.
我认为我们必须做些什么来保护环境。
The situation is so urgent that we must take an effective way to solve the problem right now.
情况十分紧急，我们必须立刻采取有效措施解决这一问题。
Whenever we are in trouble, we must never lose heart, but try to think of the way out.
每当我们遇到困难时，我们绝不能灰心，而是要努力想办法解决。
Even if it takes us three days, we must get the job done.
豁出三天时间，也要把它做好。
To learn a language we must follow the principle of gradual improvement.
学习语言必须遵循循序渐进的原则。
With power and to spare we must pursue the tottering foe.
宜将剩勇追穷寇。
Knowing is not enough; we must apply.
知道是不够的，我们必须实践。
So we must dig and delve unceasingly.
所以我们必须不懈地探索深究。
Explain that life is a gift we must cherish.
让他们懂得，生命是一份珍贵的礼物。
Instead, we must take charge of our own destinies.
我们必须掌握自己的命运。
So we must move quickly to turn this initiative into reality.
我们必须迅速采取行动，将这一计划落到实处。
When we have not what we love, we must love what we have!
当我们不能拥有所爱时，我们必须爱我们所拥有的。
It is just a long and difficult road. And we must not give up.
虽然还有很长的路要走，但我们不会放弃。
We must work, and above all, we must believe in ourselves.
我们必须工作，而且最重要的是我们必须相信自己。
This is the moment when we must come together to save this planet.
此刻，我们必须团结一心拯救这个星球。
So whatever we think of the past, we must not be prisoners to it.
因此，无论我们如何看待过去，我们绝不成为它的俘虏。
Every day we must ask ourselves: have we done everything that we can?
我们必须每天都问自己：我们已经竭尽全力了吗？
Finally, we must never underestimate the power of human ingenuity.
最后，我们永远不能低估人类创造力的力量。
And we must not allow the perfect to become the enemy of progress.
我们绝不能容许完美成为我们进步的敌人。
Knowing is not enough, we must apply; willing is not enough, we must do.
仅仅知道是不够的，我们必须应用；仅仅愿意是不够的，我们必须行动。
Their future depends on the action we take now, and we must not fail them.
他们的未来取决于我们现在采取的行动，我们绝不能辜负他们。
And most of all we must share with them our hope for the future, their future.
最重要的是，我们要和孩子们分享对于未来的希望，那是他们的未来。
To address these problems, we must do our part to protect our environment.
为了解决这些问题，我们务必尽力保护我们的环境。
We must preserve our heritage and legacy. It is a responsibility we must all bear.
我们必须保护好我们的遗产和传统，对此我们每个人都责无旁贷。
In order to see the beauty in front of us, we must be able to see the beauty inside of ourselves.
为了发现我们面前美好的事物，我们必须能发现在自己内在的美。
We are each of us in this world an angel with only one wing. In order to fly we must embrace each other.
我们每个人都是世界上只有一只翅膀的天使，必须相拥在一起才可以飞翔。
We are each of us in this world an angel with only one wing. In order to fly we must embrace each other.
我们每个人都是世界上只有一只翅膀的天使，必须相拥在一起才可以飞翔。
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