男孩一点一点地学会了信任他的新朋友。

___Little ___by ___little, the boy learned to trust his new friends.

她对这门学科的理解在整个学期中一点一点地增加了。

Her understanding of the subject increased ___little ___by ___little over the semester.

我们在这个项目上正一点一点地取得进展。

We are making progress ___little ___by ___little on the project.