at one whack的用法和样例：
- Want to have a try of all Southeast Asia food from Philippines, Thailand, Indonesia, Malaysia at one whack?
- He lost all his wealth all at one swoop.
- The teams are all square at one match each.
- Swallow a glass of beer at one gulp.
- The pipe splays (out) at one end.
- He was at one time so devoted to piano playing.