base observation time的意思|示意

The tower, with a square base, reminds us of a fort tower and it is not known whether it was a belfry, an observation tower, or both at the same time.

塔的地基为正方形，使我们想起了一座堡垒，只是不知道它是钟塔还是观察塔或者两者都是。

Firstly, the characteristics of debris-flow sediment transportation such as intensity, granule gradation and space-time variation were discussed on the base of continuous observation data.

在连续观测资料的基础上，对泥石流输沙的强度、级配和时空分布特征进行了分析。