be proficient at

基本解释

Conclusion:Laparoscopic total hysterectomy is safe and feasible, but operators must be proficient at the suturing techniques under laparoscopy.
结论：腹腔镜下全子宫切除术安全、可行，但必须掌握熟练的镜下缝合技术。
The complexity is rapidly reaching a point of critical mass, where one single developer can no longer know everything needed to be proficient at his or her job.
复杂性迅速地到达一个临界点，即一个单独的开发者已经不能精通他或她工作中的方方面面了。
Statistically, an astronaut is more likely than the average person to be proficient at playing an instrument. There are a few instruments on board and the occasional jam session will happen.
空间站里有一个业余无线电系统，在合适的时间，设备正常的情况下，地上的任何人都可以与他们通话。

You have to be extremely proficient at electricity, at computerized controls.
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But to be fully proficient at making an omelet from the leftovers in your fridge, you need to grasp the finer points of seasoning, timing and creative thinking.
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Back in his Stanford laboratory, Khosla admits that he has a way to go before his approach can be as proficient at churning out druglike compounds as automated chemistry robots.
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