以二羧酸和异丁醇为原料,用硫酸作催化剂,合成二羧酸二异丁酯.The diisobutyl dicarboxylate was prepared by using acid and isobutanol as material and acid as catalyst.以冰醋酸、异丁醇为原料,硫酸高铈为催化剂合成乙酸异丁酯.A method for synthesis of isobutyl acetate based on ceric ...
There was an incredible din.声音异常嘈杂。The children were making an awful din.孩子们吵得厉害。The whole lobby was a perfect pandemonium, and the din was terrific.整个门厅一片嘈杂, 而且喧嚣刺耳....
An impulse of feeling now overcame her timidity, and Hetty spoke.一阵感情激动冲破了羞怯, 海蒂终于说话了.Again, such timidity is misplaced.这种胆怯又一次错位了.The new dancer smiled with a charming air of maidenly timidity and artlessness.新舞蹈演员带著少女般...
As Wren's epitaph famously declares, the cathedral itself is his monument.众所周知，雷恩的墓志铭中写道，大教堂本身就是他的纪念碑。Authors are famously ignorant about the realities of publishing.作者们不了解出版界的实际情况，这是人所共知的。My mother and my mother - ...
At the horizon the land mass becomes a continuous pale neutral grey.陆地在地平线处变成了一片浅灰。Under TQM principles the search for quality is continuous.在全面质量管理原则下，对质量的追求是持续不断的。We are seeking continuous, incremental improvements, no...
He is not as friendless as he appeared to be.他并不像看上去的那样孤独无助。My friend fails to mention the long and friendless winter evenings which are interrupted only by an occasional visit to the local cinema —— virtually the only f...