No such masstesting has been done before at a French school, AFP news agency says. The test is voluntary.
法新社称，之前在法国学校从未有过这么大规模的检测。检测是自愿的。
2
Design and testing of these physical systems rely on standard design practices that employ the laws of conservation of force, mass, and energy.
这些物理系统的测试依赖于对作用力、质量和能量守恒定律的标准设计实践。
3
Many scientists are already testing different prototypes to put an end to the yearly race to predict coming flu strains and quickly mass produce a new vaccine each flu season.