副 to the greatest extent，at the furthest end of，[方]keep on doing sth.；介 （以某个范围为极限， 不得超过） within the limits of；动 （让某些人或事物尽先） give priority to；

[例句] 这家矿泉疗养浴场极尽奢华，功效极高。 The spa is the last word in luxury and efficiency.

[例句] 他们同意互相配合尽一切努力缓解紧张局势。 They agreed to work co-operatively to ease tensions wherever possible.