已经对系统熟练掌握 Already familiar with the system ; The system has already mastered ; Already systems master
同时，同一个班级的其他学生可能已经熟练掌握了这项技能，所以继续练习对他们来说只是浪费时间。
At the same time, other students in the same class already have the skill down cold, so further practice for them is a waste of time.
伦敦的出租车司机因对伦敦街道环境的熟练掌握，所以他们比普通人的海马区更大。
London taxi drivers who have extensive knowledge of the London city streets have larger-than-normal hippocampi.
对三点一线的瞄准和其他辅助瞄准具完全理解，能够非常熟练掌握。具有极强的瞄准意识和能力。
The aim of the three-point line and other auxiliary sight fully understood, can be very familiar with. A strong awareness and ability to target.
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