Hxen.com's tips：Every day persisted can learn English well!-->■Learn English Everyday■
gatekeeper –n. a person or company that controls access to something
default –n.(computer) a setting that a computer operates in if a user does not choose a different setting
preinstalled –adj.(computer) a program that comes with a computer or device from the manufacturer and does not have to be added by the user
alternatives –n.(pl.) additional choices that can be made instead of something else
distribute –n.(computer) the process of providing software to the user
