公众演讲是一种可以后天习得的技巧，就像弹钢琴或画画那样，可以通过训练学得。当然，这需要一定时间，也需要不断的练习以及行家的指导。
Public speaking is a learned skill, developed much like other skills, such as playing the piano or painting: over time, with practice and some guidance.
最后的操作是对账单表的更新，这需要花费一定时间。
The final kicker is an update to the bill table which takes quite some time.
“脱敏”疗法必须在移植手术之前进行，且需要一定时间——某些病人甚至需要两周，这决定了患者必须拥有一位活体供者。
The desensitization procedure takes time - for some patients as long as two weeks - and is performed before the transplant operation, so patients must have a living donor.
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