They are terser, more to the point and less euphuistic.

它们更为简洁，更加切中要点，而更少止于华丽词藻。

This can be marginally more efficient than using a temporary variable and, by making the code terser, makes it either easier to read or more cryptic, depending on your point of view.

这样比使用临时变量效率更高，代码也变得更加简要，至于这样的代码是易读还是含混，就取决于您的观点了。