但是，其中十分之一的人在一生中某一天会成为活动性结核病患者，主要原因是其免疫力减弱。
However, one in 10 will become sick with active TB in his or her lifetime due primarily to a weakened immune system.
沙波具有一定的活动性，主要由SE向NW方向移动，且活动性逐渐减弱。
The sand waves move to some extent, with the main direction from SE to NW, yet this trend is gradually becoming weak.
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