SD

例句：

1. 1.The speed of light is the fastest known speed in the universe.
   光速是宇宙中已知的最快速度。
2. 2. The scientist discovered a new method to study the atomic structure of matter.
   科学家发现了一种新的研究物质原子结构的方法。
3. 3. The team worked tirelessly to develop a new drug that could save lives.
   团队不懈努力，开发了一种可以挽救生命的新药。