Usually, T should be about 3000 times larger than the time interval, not too small and not infinite, so that the wet zenith delay can be modeled correctly.

是所取状态未知数时间间隔的3000倍左右，不能太小，又不能趋于无穷大，以。

youdao

Zenith's slide into oblivion didn't begin until after the death of MacDonald, in 1958.

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