“食指”造句

弗兰妮把食指放在嘴唇上让她安静。
Frannie shushed her with a forefinger to the lips.

他用拇指和食指捏着笔。
He took the pen between his thumb and forefinger.

他的食指扣住扳机,然后又松开了.
His index finger tightened on the trigger but then relaxed again.