What is more, setting up a TelePresence meeting is as easy as making a telephone call. Facilitators are no longer needed.

You don't need to bring a ruler to estimate partial derivatives the way that this problem asks you to.

In CCD Auto-guide Unit system of One-meter infrared solar telescope (YNST), the display and update of full-disk solar-image put forward much higher requirement to the real-time capability of display.