ScientistsscientistsL1运用科学方法来解答关于可测量宇宙问题的科学家；科学家可能从事原创研究，也可能利用他人的研究成果One whose activities make use of the scientific method to answer questions regarding the measurable universe. A scientist may be involved in original research, or make use of the results of the research of others. used a computercomputerL1一种能够自动进行计算的机器a machine for performing calculations automatically to make a new vaccinevaccine/vækˈsiːn/L1疫苗a medicine that helps your body fight sickness. The computer looked at many viruses. It found parts that stay the same. The vaccine can fight many viruses at once.
This vaccinevaccine/vækˈsiːn/L1疫苗a medicine that helps your body fight sickness is a DNA vaccine. It does not need a needleneedle/ˈniːdəl/L1针头a thin, sharp piece of metal used to give medicine. A streamstreamL1：流动或流淌的行为the act of flowing or streaming of air puts it in your skinskinL1活体动物的体表覆盖物body covering of a living animal. That is less scary for kids.
The testtestL1测试；试验the act of testing something in people was safesafe/seɪf/L1安全的not dangerous; protected from harm. It made the body ready to fightfight/faɪt/L1抵抗，对抗to try to stop something bad viruses. But we need more tests. It is an excitingexciting/ɪkˈsaɪtɪŋ/L1令人兴奋的making you feel happy and interested start.
