好好利用信封。
Use the envelope system. It's the same idea as using cash for spending, but in addition you use envelopes to split your spending cash into categories.
这与使用现金是一个道理，只不过你需要用信封类为你的开支分类。
Skylifter plans to use several such drives to control the craft’s horizontal motion, and also to aid a buoyancy-control system within the envelope in moving the vehicle up and down.
Skylifter计划使用若干这种驱动器来控制飞船的水平运动，同时也辅助安装在气球内部的浮力控制系统操纵飞艇的升降。
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