Heliograph
n. 日光反射信号器, 太阳摄影机, 日光仪\\nv. 用太阳摄影机拍摄, 用日光仪传递
🗣️ 情景例句
Oh my!
噢 ，我的天！
There are only two minutes left.
只剩两分钟了。
If we could actually see the path described by a particle,such as a sand grain in the rock,
假如我们真能看到的运动轨迹，诸如岩石中一个沙粒分子