You can take a cue from GCC: maintain many sets of environment variables per application and switch from one pool to another depending on the work at-hand.
您可以从 GCC 得到提示：为每个应用程序维护多个环境变量集，并根据手头的工作从一个集合切换到另一个集合。
At around six months old many babies can move an object from one hand to another.
在大约六个月大的时候，许多婴儿可以把一个物体从一只手移到另一只手。
“Run!” commanded Mrs. Arable, taking the pig from Fern and slipping a doughnut into her hand. Avery grabbed his gun and another doughnut.
“快跑！”阿拉布尔太太命令着，把小猪从弗恩手里抱过来，又把一个炸面圈塞到她手上。埃弗里赶紧抓起他的枪和另一个炸面圈。
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