normal close

• 常闭,常断阀

normal close的用法和样例：

例句

1. A lot of times people like to close their eyes while listening to music to feel more immersed in it, said neuroscientist and psychiatrist Talma Hendler.
   人们常闭眼听音乐以更融入其中，神经学和心理学家韩德勒说。