sternness

例句:

• I watched my master's face pass from amiability to sternness.
  我瞧着老师的脸上从和蔼变成严峻.
  
• The patrol leader, with a show of sternness, demanded, " Who is this? "
  那巡官于是装成很有威风的神气开了口: “ 这是什么人? ”
  
• Roosevelt solved the difficulty by judicious mixture of courtesy and sternness.
  罗斯福明智地混合运用礼貌与严峻来解决这个困难.