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Egg white is said to be essential for a Fizz, but optional for a Sour or Collins.

蛋清是菲士的重要部分，也可随意加入酸酒杯或可林直杯。

Flasher is optional in accordance with user, s requirement.

根据用户要求可以加装闪光器。

In addition to an optional 4 Prime Focus Field Flattener, we offer a dedicated f5.75 Flat-Field Telecompressor that is diffraction-limited over the entire 35mm field.

除了可选4的主要焦点场拼合，我们提供了一个专门的f5.75平场Telecompressor即衍射，在整个35毫米领域有限。

It also supports an optional buffering graphics object if you want to paint it all before putting it to screen (flicker-free drawing).

它也支持一个随意的缓冲的图形化的对象，在你打印之前你不需预览它。

AZONA today the style with Ji Yan melting and luxuriant interpret, small coat, medium the sleeve short unlined upper garment, pants that reach knee , short skirt, clipping is distinct, lightsome and optional; Refined Wen Wan's delicate cotton cloth, frivolous snow spinning is euphemistic Yi couple, cloth of metallic gauze blending reachs knitted piece goods of silk floss blending, the simple sense of overhang and flow is full of be puzzled of mysterious fawn on; The colour of numerous beautiful romance, profusion is flowery, what golden pink fastens is tie-in, take you to experience dream and memory.

AZONA今季演译甜美华丽的风格，小外套、中袖短衫、及膝裤、短裙、剪裁层次分明，轻盈随意；雅致温婉精致的棉布、轻薄的雪纺纱委婉迤俪，金属纱混纺布及丝绵混纺针织面料，悬垂与流动的质感布满神秘媚惑；繁花浪漫的色彩，缤纷绚丽，金粉色系的搭配，带你体验梦幻和回忆。

The basis function of the coinjection of Nitrogen and steam is increasing the displacement volume and supply the displacement energy on the basis of Nitrogen, the result of the numerical simulation showed that, after the coinjection of Nitrogen and steam (the optional aqueous Nitrogen ratio was 1: 20～1: 50), the theamal readius increased from 30m to 55m more or less, the recovery ratio increased by 5～10％. The production effect of the high cycles steam stimulation will be improved and the pattern infill will be avoided and the economic results will be improved. 4. The poor result of steamflood is another problem. On the basis of the analysis of the foamer mechanism in the propayation, movement and stabilization, this paper showed that the main meachanism of the increasing recovery of the Nitrogen foam and steamflood was the increasing displacement factor and oil displacement efficiency.

三针对蒸汽吞吐加热半径有限（一般30m左右）而蒸汽吞吐轮次已高达5轮以上的具体情况，将氮气与蒸汽混合（套管环空中注氮气，油管中注蒸汽）进行吞吐可增加加热半径1～2倍以上；在对原油流变性研究基础上，对氮气蒸汽原油体系状态进行了分析，指出了氮气在油藏中基本上是以气相方式存在；热氮混合吞吐的基本作用为扩大波及体积和提供驱油能量；在此基础上所进行的热氮混注数值模拟研究表明：蒸汽中加入氮气后（最佳汽氮比为1：20～1：50），加热半径从30m增至55m左右，采收率可提高5～10％以上，大大改善了高轮次蒸汽吞吐的生产效果，可避免大规模井网加密，提高了经济效益。

Bariatric blood drawing chairs feature a 96.5cm (38) wide upholstered seat, raised footrest, and optional storage cabinet.

超重抽血椅带有一个96.5cm (38)宽的软座，凸起脚凳和可选择的储存柜。

Is even an optional else clause for situations where code needs to run only when no exceptions are detected.

你也可以添加一个可选的 else 子句处理没有探测到异常的时执行的代码。

With animals such Optional Weizai Xi. How difficult behavior in animals. Therefore there is a gentlemen's concern for life, without the risk of one day also.

比如说这样的忧虑是有的：舜是人，我也是人；舜是天下的楷模，名声传于后世，可我却不过是一个普通人而已。

I guess foundations are optional in China.

我猜在中国地基是可选择的。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。