So the tension, once it starts accelerating, will go down.
加速的时候绳子的张力,会减小。
It is no use trying to catch up with the train once it starts.
当火车启动时,设法赶上那趟车是徒劳的。
The devices need to be communicated to once it starts sending messages.
这些设备一旦它开始发送消息就需要通信。
So, I will point out, in terms of MO theory, because it rigorously does take into account quantum mechanics, it starts to become complicated once we go beyond diatomic molecules.
我要指出的是,对于MO理论,以为它严格的遵守量子力学,所以一旦超过双原子分子,就变得十分复杂了。
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