drop by drop

例句：

1. 1.She worked her way up the corporate ladder by dropping by drop.
   她一点一点地往上爬，逐步提升。
2. 2.The project was completed bit by bit, with each section completed before moving on to the next.
   这个项目是一点一点完成的，每个部分完成后才继续下一个部分。
3. 3.He started his business by dropping by drop, building a strong foundation for future growth.
   他开始他的事业时，是一点一点建立基础的，为未来的增长打下坚实的基础。