A single flower does not make a spring .
一花独放不是春,白花齐放春满园。
One flower does not make a spring; one swallow does not make a summer.
鲜花一朵还不是春天,孤燕一只不成夏天。
One swallow dose not make a spring.
一只燕子不代表春天的到来。
First, we got to make sure the spring exerts a fixed force every time.
首先,要保证,弹簧每次产生的力是恒定的
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