石墨层中的碳原子相互连接形成碳环。In graphite sheets, carbon atoms bond together in rings.碳化合物氧化后必然会产生二氧化碳。Carbon dioxide is a necessary result of the oxidation of carbon compounds.食物由碳水化合物、蛋白质和脂肪构成。Food is made up of carbohydrates, prot...
She is equally at home on the singles or doubles court.她单打和双打都能得心应手。Vic Seixas and Doris Hart won the mixed doubles.维克·塞克萨斯和多丽丝·哈特赢得了混合双打冠军。She paired off with Alice in a tennis doubles match.她在网球双打比赛中与阿莉斯结成一对....