常見例句All the cadets in his squadron were sworn to secrecy and rehearsed in the dead of night on the auxiliary paradeground. 他中隊(duì)里的全體學(xué)生都宣誓保密，在夜深人靜時(shí)到輔助練場(chǎng)上演習(xí)。 返回 paradeground