a troy bit的用法和样例：
- I never yet could ascertain properly whether you are a Whig or a Troy.
- He bit off a large piece of the apple.
- She was a bit queer after her husband deserted her.
- However, gold was outshone in 2003 by other precious metals. Silver gained 25 per cent, hitting $6 a troy ounce for the first time since May 1998.
a troy bit的相关资料：