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。
But, of the vertebrates, unpredictable Nature selected only snakes (and one lizard).
不过,当它们相互撕打时,毒液就成了利弊参半的武,可以杀死对方,也可以被对方的毒液杀死。