KeePass和LastPass功能类似，并且完全免费的。
KeePass and LastPass are both completely free applications with a similar set of features.
Circles(圈子)功能类似facebooke的朋友列表。
The Circles section in Google+ is like Facebook's friend lists.
与线程池的功能类似，TPL能够在线程和处理器之间实现负载均衡。
Like a thread pool, the TPL can perform load balancing across threads and processors.
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