Transcript:

They have a tough mission ahead.

Thousands of members of the Saudi security forces have been taking part in a parade ahead of the world's biggest religious gathering.

The Hajj involves over 2 million Muslim pilgrims.

With tensions simmering in the region, particularly in Lebanon and Syria, the logistics are even more complicated than usual.

Vocabulary:

mission n. 使命，任务

parade vt. 游行，炫耀，列队行进

pilgrims v. 去朝圣；漫游

simmering vt. 慢煮

logistics n. [军] 后勤，后勤学，物流