常見例句The swimmer was timed at 50.50 sec. 這名游泳者的成績被測定為五十點五零秒。The divergence time is now greater than 30 sec. 發(fā)散時間超過30秒。His time of 3 min 2 sec remains unbeaten. 他那3分2秒的記錄仍未打破.Aim:to prepare propyl p-hydroxybenzoate. 目的:制備對羥基苯甲酸丙酯。It is from, hang on a sec, oh yeh, Japan. 那是來自,等一會兒,對了,日本。It's the hang on a sec,yes,the 10th of May. 那是,等一會兒,對了,5月10日。 返回 sec-propyl