They've promised to keep both we quality and the quantity of the 300 bicycles in conformity with the contract stipulations.
他们已承诺那300辆自行车的质量和数量一定与合同规定相吻合。
Imagine a railway station, a bus company or a cinema, which many people need to ring to find out the times of trains, buses or films.
想一想,有许多人需要打电话到火车站、汽车公司或电影院,以便弄清火车、汽车的起始时间或电影放映的时间吧。