However, the pace and timing of the recovery is still highly uncertain.
然而，复苏的速度和时间仍然是十分不确定的。
The future of schools like this one, however, is uncertain.
然而现在，这些学校却前景难料。
However, this picture has become more uncertain.
然而，这里的画面变得更加不确定。
However, it is uncertain whether or not the breed existed in the area even earlier.
不过，这是未知数或不存在的品种在该地区，甚至更早。
However, the benefits of this treatment approach have been uncertain.
然而，这种治疗方法的益处是不确定的。
Whether they'll manage to block the new policies is uncertain, however.
但他们是否能设法阻止这些新政策的实施尚是未定之数。
Whether they'll manage to block the new policies is uncertain, however.
但他们是否能设法阻止这些新政策的实施尚是未定之数。
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