心肌细胞在实验室很难制得，如果培养不当，它们很有可能变成一团规则而不会跳动的细胞。
Cardiomyocytes are tricky to make in the lab, developing into clumps of regular, non-beating cells if they are not developed properly.
2008年11月，欧洲委员会就说，它们想要更新动物实验规则，在欧洲范围内更好的保护实验室动物。
The European Commission said in November 2008 that it wanted to update the rules to better protect laboratory animals throughout Europe.
我们做实验时，就要遵守实验室的规则。
Weshould follow the rules of the lab when we are doing experiments.
一旦这些检测实验室就绪，我们将要求烟草业遵循规则，”这名官员说。
Once the testing labs are in place, we will press for the industry to follow the rule, " the official said."
网络实验室用户管理系统设计部分，优化了用户管理规则，并说明了基于JSP技术的网络实验室用户管理系统的实现方案。
The design of the user management system includes the optimization of the user management rules, and an implementation to the user management using the JSP technology is presented.
网络实验室用户管理系统设计部分，优化了用户管理规则，并说明了基于JSP技术的网络实验室用户管理系统的实现方案。
The design of the user management system includes the optimization of the user management rules, and an implementation to the user management using the JSP technology is presented.
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