ーto pull a hand grenade pin out with your finger
「手榴弾のピンを指で抜く」
ーto pull a hand grenade pin out with your teeth
「手榴弾のピンを歯で抜く」
hand grenade で「手榴弾」
to pull ... out with one's finger で「…を指で引き抜く」
to pull ... out with one's teeth で「…を歯で引き抜く」
例:
You see soldiers in movies pulling out hand grenade pins with their teeth. I wonder if soldiers actually do that.
「映画で兵士が歯で手榴弾のピンを抜くのを見るけど、現実でもやってるのかなあ」
ご参考まで!