例句與造句

1. :A " lens " may be more than a convex piece of glass, where the failure mode would be cracking due to uneven heating, or in the extreme literal melting.
2. The doctor is carrying four wrist watches; a beautiful dealer in art is carrying a bottle of quicklime and another of phosphorus; and the owner of the Anglo-Egyptian Importing Company is carrying the ringing mechanism of an alarm clock and a convex piece of glass.
3. It's difficult to find convex piece in a sentence. 用convex piece造句挺難的