The secondary level is the list of options that fall into each group.
ÿ第二级是各组内的选项列表
We saw the level of the water fall slightly.
我们看到水面稍稍下降了一点。
One more drop of challenge, our confidence level is going to free-fall to the end-point...
再滴加一滴挑战，置信度就会以自由落体之势坠入滴定终点。
One more drop of challenge, our confidence level is going to free-fall to the end-point...
再滴加一滴挑战，置信度就会以自由落体之势坠入滴定终点。
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