The system task named while loop points to an activity set that contains tasks corresponding to the ones in the while loop (Figure 12).
名称为while循环的系统任务指向一个活动集，该活动集包含与while循环中的任务对应的任务(图12)。
Bonus points if you can overlay a caption coming from the thumbnail Alt tag, or loop through the photos if the user hasn't clicked one for a minute.
如果你能覆盖缩略图alt标记的标题就奖励积分，或是在用户一分钟内未点击的时候进行图片循环。
It also points out that the magnetic field of unlimited length solenoid cannot be calculated only by Ampere 's Loop Law.
指出无限长载流螺线管的磁场是不能仅由安培环路定理求出的。
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