1. If it (whatever it may be) won't compute and you can't drink it, smoke it or spend it, then "it" holds little value.
    学生们认为如果某种东西 (不管它是何物) 没有实际的经济意义，你不能把它当酒喝、当烟抽、当钱花，那么 "它" 就简直毫无价值。

2. Ask the waiter to compute the bill.
    请侍者算帐。