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.
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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