In my newspaper column some months ago, I reprinted a short essay on youth by Samuel Ullman, an author unknown to me. 数月前,笔者在敝报专栏转载了一篇论青春的短文,对作者塞缪尔.厄尔曼其人我并无所知。
Samuel Ullman was born in1840 in Germany and came to American as a boy. 塞缪尔.厄尔曼1840年生于德国,童年时移居美国。
In previous centuries, the convergence of cultures and trade led to the emergence of pidgin-a streamlined system of communication that has simple grammatical structure, says Michael Ullman, director of research at Georgetown University's Brain and Language Lab. 过去几个世纪,文化和商贸的融合导致了洋泾浜语的产生,这是一种简洁实用的交流语言,语法结构简单,乔治城大学大脑和语言实验室的主任迈克尔-厄尔曼这样解释道。
I reprinted a short essay on youth by Samuel Ullman, an author unknown to me. 我转载了一篇论青春的短文,其作者塞缪尔?厄尔曼,我并不熟悉。
α-DDB was synthesized by using gallic acid as initial material, through esterification reaction, monomethyl ether reaction, bromination reaction, cyclization reaction and Ullman reaction. 本论文以没食子酸为起始原料,通过酯化反应、单甲醚化反应、溴化反应、环合反应和Ullman反应合成了α-联苯双酯。