a beaker of coffee的用法和样例：
- He was drink ing coffee while he worked, and frequently dipped his brush in a beaker of turpentine to clean it.
- I usually have a boil egg and a cup of coffee.
- Place the resultant sample coil into a beaker of boiling deionized water.
- How about a cup of coffee at a nearby coffee shop?
- He asked me to make him a mug of coffee.