回複：

“On passenger vehicles, a load may not extend beyond the line of the tandem.”

這句話在阿拉巴馬的駕駛手冊裏。問了幾個美國同事，沒人明白“the line of the tandem”是什麽意思。

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Tandem means double, and in this case, it represents the two axes of a passenger vehicle. The “line of the tandem”, is the range between the two axes. If you want to place a load on top of your car, you can only place it between the front and the back axis.

By the way, how could you be a Chinamerican? Nether US nor China accepts dual citizenship.