Explanation: Metaphor based on changes in the situation turn, play it by ear. Chai calyx "Lu Cong recorded Brahma wonderful sentence": "rude is no desire by the Seoul also only turn to take advantage of the wind sail, timely turn only." Also for "taking advantage of the wind turn tent." AI Ming the "fire" Chapter XII: "Qiu Dekui not seeing the momentum, and immediately turn to take advantage of the wind canopy."