There was no first tier evidence.

并无第一级证据。

youdao

The first tier is the data collection.

第一层是数据采集。

youdao

The same situation is happening in other first-tier cities.

其他一线城市的情况也差不多。

youdao

The same situation is happening in other first-tier cities.

其他一线城市的情况也差不多。

youdao