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立体与立体相交称之为，表面形成的交线称为。

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Now graduating is a big achievement under any _________. Some of you have had to overcome serious obstacles along the way, whether it was an illness, or a parent losing a job, or living in a neighborhood where people too often count you out. Along with the usual challenges of growing up, all of you have had to deal with the added pressures of social media, reports of school shootings, and the specter of climate change.

And then, just as you’re about to celebrate having made it through, just as you’ve been looking forward to proms and senior nights, graduation ceremonies — and, let’s face it, a whole bunch of parties — the world is turned upside down by a global ___________.

And as much as I’m sure you love your parents, I’ll bet that being stuck at home with them and playing board games or watching Tiger King on TV is not exactly how you __________ the last few months of your senior year.

Now I’ll be honest with you — the disappointments of missing a live graduation — those will pass pretty quick. I don’t remember much from my own high school graduation. I know that not having to sit there and listen to a_________speaker isn’t all that bad — mine usually go on way too long.