在工程学看来，这是成本、维护和速度的交换。
From an engineering perspective, there are tradeoffs among cost, maintenance, and speed.
(在工程学看来，这是成本、维护和速度的交换。)
(From an engineering perspective, there are tradeoffs among cost, maintenance, and speed.)
在交换经济中，每个人的货币收入同时又是另外某个人的成本。
In an exchange economy everybody's money income is somebody else's cost.
在交换经济中，每个人的货币收入同时又是另外某个人的成本。
In an exchange economy everybody's money income is somebody else's cost.
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