It is spring only when all the flowers are blooming.

万紫千红才是春。

《新英汉大辞典》

But it is spring now. It is warm in spring.

但现在是春天了。春天天气暖和。

youdao

It is spring again and the window can be left open as often as one would like.

又是春天，窗子可以常开了。

youdao

Now it is spring in the northern part of the world so it is time to celebrate that season.

VOA: special.2010.03.15

Newton is not going to come and tell you what force the spring will exert when it's pulled by some amount.

牛顿不会过来告诉你,弹簧被拉伸一定量时会产生多大的力

耶鲁公开课 - 基础物理课程节选

If you connect the body to a spring, which is neither compressed nor extended, there's no force acting on it.

如果将一个弹簧连在这个物体上,弹簧既没有被压缩也没有被拉伸,也不会有力作用在它上面

耶鲁公开课 - 基础物理课程节选

They prefer to walk around in the drizzle, pretending it is spring.

ECONOMIST: An Italian in Liverpool

It is spring in McAllen, Texas.

NEWYORKER: The Cost Conundrum

Beneath it is the spring-loaded keypad cover and mouthpiece, which snaps down into position when you receive a call.

ENGADGET: Nokia 7110 review Mobile