It's just the matter of the schedule,that is,if it is convenient of you right now.
如果你们感到方便的话,我想现在讨论一下日程安排的问题。
The operation, which lasted for over four hours, proved to be very difficult because of the hard resin which covered the skin.
手术持续了4个多小时,非常难做,因为皮肤上覆盖着一层硬硬的树脂。