Vestibular tree I planted red and blue, to see the second spring buds.
前庭手种红兰树,看到春风第二芽。
After that, the spring on Nine Dragon Hill became officially the Second Spring Under Heaven.
从此,九龙山泉水,便定为“天下第二泉”。
There is a spring in Wuxi, known as "the second spring in the world" where Ah Bing liked to linger.
无锡有一口泉,叫做“天下第二泉”,那是阿炳常去的地方。
For example, how do I know that when I pull the spring the first time for the mass, it exerted the same force when I pulled the spring the second time for the elephant?
例如 怎样才能知道,第一次连着物体拉弹簧时,产生的力和,第二次连着大象拉弹簧时产生的力是相等的呢
We did the comparison with the elephant or something; a is the second derivative of x and for this problem, when F is due to a spring, we know the force is that by studying the spring.
我们也已经把它与大象或其它东西作过比较,a 是 x 的二阶导数,在这个问题中,F 是由弹簧产生的,我们在讨论弹簧问题时已经知道了力的大小
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