doorstop造句怎么写

er's three major books on economic and corporate competitiveness are footnote-filled doorstop tomes, but roughly a half a million copies have been sold. His instructional videos sell like hotcakes.

This silly brand doggy doorstop is as practical as it is cute.

Here we use robotically-controlled micromanipulators and extremely sharp glass needles to machine the aerogel, and extract tracks in tiny doorstop-shaped wedges of aerogel that we call "keystones".