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。
that is something like 6,000,000 spiders of different kinds on a football pitch.
这就是说,在一个足球场上约有600万只不同种类的蜘蛛。