给防守队员做接球练习的击球员的英文

knocker

• 给:    supply; provide
• 防守:    defend; guard
• 队员:    team member
• 做:    make; manufacture; ...
• 接球:    catch a ball
• 练习:    practise; practice
• 的:    4次方是 The fourth po ...
• 击球员:    batter; batsman