* @param {number[]} speed 每辆车的速度数组（英里/小时）
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17. What is a commission rate? Commission rates are typically based on a percentage of the total sale and in some cases can also be a flat fee for each transaction. The rates are set by the merchant.
It’s compact and set up is easy. It sits neatly behind your TV (without blocking other HDMI ports), and it even powers directly from the TV, so there’s no extra clutter or cables for a wall outlet. When you turn it on, you’ll get all the major apps in one place, plus hundreds of free live TV channels. It also comes with a voice remote that handles everything including volume, power, and search so you don’t need to juggle multiple remotes.