Two million used books were sold on the online platform Deja Vu in 2018.

2018年，在线平台 Deja Vu 卖出了200万本二手书。

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A burst of light is seen by two observers: one stationary on a platform, the other moving in a train.

两个观察员看到了一束光的爆发：他们一个静止在平台上，还有一个在火车上移动。

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There are two front-runners. One is Bronislaw Komorowski, from the governing center-right Civic Platform party.

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He sees a two-platform system as a "weakest link" scenario, in which a determined cyber-intruder will seek out the more vulnerable of the two targets.

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Kevin Depinet, whose long list of memorable design credits includes Chicago Shakespeare's "Follies" and the Goodman Theatre's recent revival of "The Iceman Cometh, " has conjured up the simplest of sets, a two-step platform framed by elegant-looking curtains.

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What it is, is a 16- by 14-inch aluminum platform with two 14-inch wheels on either side, and a scooter-style handlebar on a stem.

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