I'm cautiously optimistic.
我持谨慎的乐观态度。
She is an obedient woman.
她是位温顺的女人。
A key resource to be used at an opportune moment.
王牌适当时刻所用的关键手段。
The offer could not have come at a more opportune moment.
那个建议提得正是时候。
Yes, and it can be as ornate as you want.
可以，尽你所想的豪华。