aim at
1. 瞄准
He aimed at the bird but missed.
他瞄准那只鸟射击, 可是没打中。
2. 以……为目的
What are you aiming at?
你的用意何在?
aim for
I was aiming for the tree.
我瞄准了那棵树。
2. 致力于
We'll aim for quality.
我们将力求提高质量。