I actually do not see the annular eclipse ?

我居然没有看到日环食？

Performance studies of annular pulse detonation engine ejectors .

环形脉冲爆震发动机引射性能研究。

The basis for annular pancreas is uncertain .

环状胰腺的原因不清楚。

Release annular pressure rapidly to shut in the well .

快速释放环空压力关井。

The annular eclipse began in china at 4:41 p.m. local time .

中国的日环食于当地时间下午4点41分开始。