上世纪90年代末，我参加了一个动感单车班，当时我认为这是我做过的最棒的健身项目之一。

In the late 1990s, I attended a spinning class and thought it was one of the best workouts I had ever had.

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我们再来看一看“震动感应器”的工作原理：首先，金属棒就是用来感应路面上有无震动的。

"Now let's look at the" sensors "and it works: First, the metal rod that is used to sense whether the road vibration."

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