If the door was locked, nobody could access the stairs and the door bellbutton, except the person had a key.
如果门关着,没人可以走上楼梯去按门铃,除非有钥匙。
2
Investors are recognizing social networking as the next major wave of Internet companies, he says. he also notes that one no longer rings the NYSE bell, one pushes a button that makes a bell sound.