他在大学里学习了英国手语以便与聋人交流。

He learned ___BSL at university to communicate with deaf people.

吐鲁番盆地的最低点海拔-154米，是中国陆地最低的地方。

The lowest point of the Turpan Depression is 154 meters ___BSL, making it the lowest land elevation in China.