扣紧

Within a short time, everything on the submarine was buttoned up.

不一会儿, 潜水艇内所有西都扣紧了。

Hook the bottom of the earhook onto the lower hinge pin, then lift and pull the top of the earhook over the upper hinge pin.

将耳机挂钩底部在耳机下端扣上，从下端扣拉起并将挂钩上端与耳机顶部扣紧。