be placed on 和be placed in的区别

be placed on
被放置在
例句
1.This witness has committed perjury and no reliance can be placed on her evidence.
这名证人作了伪证，她的证词不可信。
2.One safeguard that can be placed on any security model is graduated data access.
可应用于任何安全模型的一种防护措施是分级数据访问。
3.An external Web server can be placed on the extranet or in the DMZ.
外部Web服务器可以放在外部网或DMZ中。
be placed in
被安排在；被放置在；
例句
1.Subheads should be placed in the middle of the column.
小标题一律居中。
2.Occasionally his behavior became so uncontrollable that he had to be placed in a straitjacket.
他的行为偶尔会变得如此失控，不得不给他穿上约束服。