If a part of your body is poised, it is completely still but ready to move at any moment.
He studied the keyboard carefully, one finger poised.
他仔细研究了键盘,一根手指准备敲击。
If someone is poised to do something, they are ready to take action at any moment.
US forces are poised for a massive air, land, and sea assault.
美军做好了随时发动大规模陆海空攻击的准备。
If you are poised, you are calm, dignified, and self-controlled.
She was self-assured, poised, almost self-satisfied.
她自信、沉着,几乎有些自满了。