特殊疑问句：声调在句尾处下降。

Information Questions: the voice generally drops at the end.

youdao

到目前为止，俄罗斯野外的着火点已由800多处下降到600处左右。

So far about 600 fires are still burning in the Russian wilderness, but that is down from more than 800.

youdao

随着气体流量的增大，弧梢处与弧根处的振动温度均下降，但弧梢处下降速率较快。

With gas flow rate increasing, the vibrational temperature at both tip and root decreases, but the decreasing rate at arc tip is faster than that at arc root.

youdao

So at the highest point it cannot go up and it cannot go down.

所以,在最高点处既不能上升也不能下降

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