指在网球、排球、羽毛球等体育比赛中严密有效地拦住对方的网上进攻to block a net attack

• 丹麦女队双打的封网很好。

  The Danish women's doubles team are excellent at blocking net attacks.

• 对方不便直接封网。

  The opponent was not well placed to directly block the net attack.