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”。
This is the second Spring Festival permitting Beijing residents to light fireworks within the Fifth Ring Road of the city after a 12-year ban was lifted in December 2005.
这是经过了12年的禁令之后,居住在5环以内的北京市民自2005年以来第二次允许在春节期间燃放鞭炮。
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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