戴夫背部拉伤，几乎没法踢球。Dave pulled a back muscle and could barely kick the ball.感觉一下腰背部皮肤的柔滑。Feel how soft the skin is in the small of the back.我的胳膊很累，背部肌肉紧绷得难受。My arms are tired, and my back is tense....
她动了心脏移植手术，这是为挽救她的生命而作的最后一次努力。She underwent a heart transplant in a last-ditch attempt to save her.他为了帮助我们而作的努力可真叫我们感动得要命哩.The efforts he made to help us really choked us up.因此,凡根据这样绝对不可靠的报告而作的任何结论, 我们都必须加以屏弃.For the pres...
They walked in companionable silence.他们默默地走着,很友好.He was confiding , good - natured, unsophisticated, companionable.他为人坦率,一团和气, 世故不深, 蔼然可亲.He was turning on her a glance of the companionable and persuasive manner.他以友好、殷勤的...
以单质碘为催化剂合成了环戊酮乙二缩酮.Cyclopentanone ethylene ketal was synthesized with I _ 2 as catalyst.传统的缩酮化、酯化反应工业上多采用浓硫酸作催化剂.Traditional ketalization and esterification reactions are usually catalyzed by concentrated acid in industr...