他说希望届时约有20 - 50部计程车投入运营，作为黑色出租车走向绿色计划的一部分，另外还有150辆氢动力巴士。
He said he wanted around 20-50 taxis in operation by then as part of the Black Cabs Go Green programme, as well as 150 hydrogen-powered buses.
在一家生意不错的饭店门前，顾客们排着队等待出租车，而大部分计程车都已客满。
In front of a popular restaurant, a line of customers waits for taxis. And wait. Most of the cabs are full.
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