In photography,the essential light sensitive coating on ph otographic film comprising gelatine and silver salts.

在照相技术中，覆盖在照相底片上的由胶和银盐组成的感光物质。

属类：综合句库--

The deep pool of centrist opinion in the country,that essential guarantee against violent political upheavals,is being dangerously shaken(New York Times)

这个国家根深蒂固的温和派立场、那种反对剧烈政治动荡的根本保障现在正危险地发生动摇(纽约时报)

属类：综合句库--

It’s essential .

这是必要的

属类：口语表达--

These efforts help to mask the essential emptiness of the characterization,and the absurdities and trivialities of the plots.

这些努力有助于掩饰人物性格塑造方面的本质上的空洞，以及情节上的荒谬的浅薄无聊。

属类：综合句库--

The essential oil in the perfume contains a large admixture of alcohol

这种香水里的香精油含有大量酒精。

属类：综合句库--

essential elements of plant

植物必需元素

属类：综合句库--

Both nice materials and meticulous tailoring are essential to make good-quality clothes.

质量好的服装不但需要好面料，而且有赖于细心缝制。

属类：综合句库--

One of the essential , functioning parts of a subsystem or equipment, possibly a self-contained element, or a combination of parts, assemblies, attachments, or accessories.

子系统或设备的基本组成部分或功能部件之中的一个。它可以是一种独立的元件，也可以是若干部件、装配件或附件的组合。

属类：综合句库--

It is what you sill do,not what you will say,that is essential .

最重要的是你的行动，而不是你的言词。

属类：综合句库--

The most essential is will is diligent.

最重要的是要勤勉。

属类：综合句库--