He is learning to develop the film negatives.他学洗相片.Color positive emulsions basically perform in the same way that color negatives do.彩色正片的彩色再现过程，基本上和彩色负片相同。Two negatives make an affirmative.两个否定构成肯定.In the past we have ...
This year we're going trekking in Nepal.今年我们准备去尼泊尔远足。She can't come pony trekking after all because she's in a delicate condition.她结果还是不能坐小马车旅行,因为她已怀孕.When we think of adventurers, many of us conjure up im...
我正想换工作，想尝试点不一样的事情来挑战一下自己。I'm trying to move on and stretch myself with something different.他在乡村不断换工作，为不同的柑橘园干活。He moved around the country working in orange groves.她当时漫不经心地说要换工作.She remarked casually that she was ch...
Both the free hydroxyl groups readily undergo esterification.两个自由羟基,都容易酯化.The chemical method include treating with sulfuric acid, saponification, acylation, esterification, etc.化学方法包括酸洗法 、 皂化法 、 酰化法和酯化法等.Iso - army gall...