He was ever careful to check his scripts.他一向都认真检查剧本。I drove gingerly past the security check points.我战战兢兢地开车经过安检站。Flange Insert valves are the ultimate check valves in flanged systems.法兰插入式阀门是法兰阀门系列中最佳的止回阀.The disease wa...
China was the first country in the world to synthesize crystalline insulin, a bioactive protein.中国在世界上最早用人工方法合成一种有生物活力的蛋白质--结晶胰岛素.There are many amino acids that the body cannot synthesize itself.有许多种氨基酸人体自身不能合成。Etioplas...