You must ignore them at all cost!
你必须不惜任何代价来忽视他们!
When a user agent can't parse the selector, it must ignore the declaration block as well.
当一个用户代理不能解析某个选择器的时候,它必须忽略整个声明块。
Likewise, the receiving side must not only agree to send back an ack once they receive a message, but they must ignore any duplicate messages.
同样,接收方不仅要同意一旦收到消息,立刻返回一个ack,还必须忽略任何重复的消息。
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