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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.
mission 使命，任務
parade 閱兵，列隊遊行
pilgrims 朝聖
simmering 一觸即發的
logistics 安保措施和步驟