block agent 封堵剂
gel block agent 凝胶封堵剂
gas block agent 气窜剂
anti-block agent 防结块剂
Water block removal agent 解水锁剂
sympathetic ganglionic block agent 交感神经节阻滞药
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。
Moreover, only the real estate agent — and neither buyer nor seller — would have easy access to the prices paid recently for other homes on the same block.
更有甚者，只有房产经纪人能够了解在同一个街区其他房产最近的价格，而买方和卖方都不知道。
If necessary, a thread can block on the agent until its changes have been applied, or you can specify an action to be executed when the changes are applied.
如有必要，一个线程可以阻止agent，直至其更改被应用，或者您可以在应用变更时指定执行一个操作。
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