1. But it is unclear when deal making might return to previous highs. 不过，交易数量能否回到从前的高位还是个未知数。
2. Scripture interprets Scripture, the new interprets the old, and the clear interprets the unclear. 圣经解释圣经，新约解释旧约，清楚的经文解释不清楚的经文。
3. However, it was unclear to the FDA whether that effect was directly related to the drug or the result of another factor. 然而，对FDA而言，是否这个结果是直接与该药有关还是因其它的因素所导致，目前还不明确。
英英解释
adj.
1. poorly stated or described
2. not clear to the mind
3. not easily deciphered
