Most of the benefits above can be attained in some form with other asynchronous frameworks, but usually with greater expense and a steeper learning curve.
上述大多数好处都可以通过其他异步框架以某种形式实现，但通常需要更大的成本和更陡的学习曲线。
2
So now if I take, see, I can form a single closed curve that will enclose all of this region with kind of an infinitely thin slit here counterclockwise.
如果这么做的话，就能得到区域上的一条闭合曲线,它包围了这个区域。
3
These curve inwards to form a series of openings containing concealed doors and Windows.