3. The monitor gives the operator a signal. 监视器给操作人员一个信号。
英英解释
n.
1. (mathematics) a symbol that represents a function from functions to functions
2. an agent that operates some apparatus or machine
3. someone who owns or operates a business
4. a shrewd or unscrupulous person who knows how to circumvent difficulties
5. a speculator who trades aggressively on stock or commodity markets