Art is not something that is come-at-able by dint of study.
艺术并非是通过学习研究便能掌握的东西。
2
They were able to come and go at will.
他们能够来去自由。
《牛津词典》
3
I realized that the handrail would not come off, which meant we could no longer be able to replace the power supply and repair that instrument, which meant scientists could no longer look at the universe and find life on other planets.