He fell back into the water, his breath rasping in his heaving chest...他仰面跌进了水中，胸部起伏，呼吸急促。He fell back into the water, his breath rasping in his heaving chest.他仰面跌进了水中，胸部起伏，呼吸急促。He pulled the cloth and it came away with ...
他中学时不擅长代数.He was not good at algebra in middle school.在代数里, 符号X常用来表示未知数.In algebra, the sign X usually denotes an unknown quantity.他的同学们正在绞尽脑汁地演算初等代数题.His classmates were labouring with elementary algebra....