这是一个更糟糕的解决方法：你的会话大概不会很频繁，而且和你不是很熟悉的人竞争是困难的。
This is a worse solution: your conversations will probably be less frequent, and it is difficult to compete with someone who you don't know well.
更糟糕的是，如果UI线程被阻塞一段时间（大概5秒），用户就会看到臭名昭著的“程序无反应”的对话框了。
Even worse, if the UI thread is blocked for more than a few seconds (about 5 seconds currently) the user is presented with the infamous "application not responding" (ANR) dialog.
更糟糕的是，传统的土地测量方法制作的等高线平面只能描述大概的地形而无法描述该地区大量的岩石和灌木丛。
To make matters worse, conventional land surveying produces contour plans that describe the topography only with no ability to describe the plethora of rocks and bush.
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