注意，我们使用了两个命令替代来为绘制操作生成单独的线条规范。

Notice that we use two command substitutions to generate the individual line specifications for the draw operation.

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解决方案：把处理划分为短的步骤，但是用延期命令替代 Timer。

The solution: Parcel the process into short steps, but use a deferred command instead of a Timer.

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如果对远程存储库的更改频率和范围不大，可以使用git pull命令替代。

Depending on the frequency and extent of changes to a remote repository, simply using the git pull command is often an attractive alternative.

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