But even this approach doesn't guarantee that you'll catch the queen. You have to examine the nest to be sure you've got one. After a few more hours of digging up nests and picking through them, Lin finally catches sight of a queen and calls it a day.
折騰二、三個小時，又連採了幾個蟻巢，蟻后都行蹤飄忽，最後總算見到一隻，才收工回校。