helpfully       
adverb uk/ˈhelp.fəl.i/ us/ˈhelp.fəl.i/
 给予帮助地,有帮助地,有用地
in a way that is helpful
  The manufacturers helpfully provide an instruction manual. 制造商提供了使用说明书,很有帮助。 
 She shut the jewel-case and took out the key. "You haven't locked it," Layla said helpfully. 她关上珠宝盒,取出钥匙。“你没有锁上盒子,”蕾拉善意地提醒道。 
 See: helpful
 - More examples
 - The waiter helpfully suggested specific dishes to order.
 - The gadget helpfully points out what you are doing wrong.
 - She helpfully informs him that it is 12 kilometres to Pearl Bay.