然后通过大量实验筛选出两种有效添加剂环丁砜和六次甲基四胺.Following that, two effective additives - syclotersuphone and methenamine are found by series experiments.我们来讨论六亚甲基四胺.We examine the study of hexamethylenetetramine.以氨水、氯乙酸为原料,以六亚甲基四胺为相转移催化剂,...
It was there before him, around him, everywhere , illimitable, immeasurable.它就在他的面前, 他的四周, 什么地方都是,一眼望不到头, 多得不可胜数.Darkness and Decay and the Red Death held illimitable dominion over all.黑暗之神、腐烂之神和红色死神以不可抗拒的力量统治一切.He had c...
时常翻动一下花圃和草坪四周会让被雨水压紧的土壤松动松动。Regular forking of beds and borders relieves the compaction caused by rain.把松动的地板块都粘好。Stick down any loose bits of flooring.用螺钉固定住所有松动的地板。Screw down any loose floorboards....