1）背离传统需要极大的勇气。（departure,enormous）

It takes enormous courage to make a departure from tradition.

2) 汤姆过去很腼腆，但这次却非常勇敢能在大庭广众面前上台表演了。（performance,bold)

Tom used to be shy, but this time he was very bold to give a  performance on the stage in public.

3) 很多教育家认为从小培养孩子的创新精神是很可取的。（creative,desirable）

Many educators think that it is very advisable to develop children's creative spirit at an early age.

4) 假设(assume.)那幅画确实是名作(masterpiece)，你觉得值得购买吗？(worthwhile)

Do you think it is worthwhile buying it, assuming that the painting is indeed a masterpiece.

5) 如果这些数据统计上是站得住脚的，那它将会帮助我们认识正在调查的问题。（throw light on,investigate,valid）

If this data is statistically valid,  it will throw light on the problems we are investigating.