of a weight的用法和样例：
- Centigram means a weight equal to a 100th of a gram.
- A steelyard is small but it carries a weight of a thousand catties.
- The cake we made was somewhat of a failure.
- A weight on the end of a line, used to determine water depth.
- Will you partake of a drink with us?
- He doubles the parts of a farmhand and a miner.