视口

例句：

1. 1. The scientist used a microscope toexamine the tiny organisms in the watersample.
   科学家使用显微镜来检查水样中的微小生物。
2. 2. The engineer designed a newsystem that could monitor the environment from afar.
   工程师设计了一个可以远程监测环境的系统。
3. 3. The astronaut had a clearview of the planet from the space station.
   宇航员在太空站上能够清晰地看到这颗行星。