There is no time like the present.

机不可失,时不再来。

there is no time like后面加一个时间，表示没有比...更好的时候了，后面可加to do something,表示没有比...更好的时候去做某事。

例：
There is no time like the present to talk with him.
没有比现在更好的时间去和他谈谈话了。
There is no time like Christmas to show your love to people around you.
没有比圣诞节更好的时候去向你身边的人表达你的爱。

1.                        There is no time like the present. 

一寸光阴一寸金。

2.                        No time like the present. 

[谚]目前正是大好时机。

3.                        At present there is no danger. 

现在没有危险。

4.                        As for the scene in the photograph where Jianxun's hands are tied up and his chest exposed: Zhou Zhuqing, the present principal, and Han Weicheng, the former principal, of the welfare home deny this ever occurred, pointing out that it would have been utterly illogical to treat Jianxun like that, as there was no need to take any protective, restraining measures on this patient, who was very weak; and there were no signs that he would take any actions to injure himself.  　　

至于照片上简训双手被绑和袒露胸膛的情形，现院长周竹青和前院长韩伟成指出，上海市儿童福利院绝对不会如此对待简训，因为简训没有自伤行为，当时又那么虚弱，根本不需要采取任何保护性约束措施。

5.                        I am sorry, there is no such vacancy at present. 

对不起，目前没有这样的空缺。

6.                        If you've got toothache, I'll make an appointment for you to visit the dentist – there's no time like the present. 

如果你牙痛，我可以安排你去看牙医－如这事必须做，倒不如现在就解决。

7.                        The trouble is that there is no time. 

苦于没有时间。

8.                        There are no doubt always positive examples that make one feels encouraged. But if we were to compare the past and present, no one would dispute that the standard of Chinese has been going downhill. 

虽然总是有让人欣慰的正面例子，不过若要在过去和现在做比较，任谁也无法否认华文程度每况愈下的事实。

9.                        There is at present no reported case of the disease. 

目前尚未报告过本病的病例。

10.                    Present Party membership is nine times than what it was at the time of the Seventh Congress.  

我们党现有的党员数目，比在第七次大会时期，已经增加了八倍。