For an object to be in static equilibrium, it is not enough that the sum of all forces is zero.
处于静力平衡的物体,仅仅所有作用力之和,为0是不够的。
It still has issues: Zipcode is enough to identify the city and state, so those attributes should migrate to a city table (instead of a state table), but that data is static, so we'll leave it alone.
它还有问题:Zipcode已足够识别国家与城市,因此,这些属性应当被迁移到city表(而不是状态表),但是该数据是静态的,因此我们可以不必理会。
We're still close enough to the summer that the air is not just filling us up with extra static electricity, so it's a little more challenging here.
我们现在离夏天更近了,这样空气中不总是,充满额外的静电,所以这时做实验,会有一些挑战性。
We're still close enough to the summer that the air is not just filling us up with extra static electricity, so it's a little more challenging here.
我们现在离夏天更近了,这样空气中不总是,充满额外的静电,所以这时做实验,会有一些挑战性。
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