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The second component is optional because this field, itself, is already defined as a referral identifier.

第二部分是可选的，因为这个域它本身已经被作为一个转诊标识符来定义的。

Thus, in Moscow, some secondary schools, while making accent on physics and maths in obligatory education, introduce the courses related to music and art for optional studying.

这样，莫斯科的一些中学在义务教育阶段，开设物理和数学，同时，也开设音乐和艺术的选修课。

If your machine has the optional hydraulic down pressure option, you will need a dedicated closed-center circuit to the seedbed conditioner.

如果你的设备有可选择的液压下降的压力选项，你就需要一个闭心的液压系统。

NET and so on, which can be accessed by anyone with VGA and 232 or USB interface of PC or IPC, placing Open optional rack, wall-mounted, set-in (required on both sides slightly unchanged).

NET等，可接任何带VGA和232或USB接口的PC机或工控机，放置放式可选支架式、壁挂式，镶入式。

And long, outer Wang Fu is optional with Sharpy, because infertility, please to the public regardless of the summer, and even married two-bedroom: Wang, Shen.

等到长大成人时，外王父替他娶了一个姓夏的女子为妻，因为夏氏生不了小孩，夏氏便向公婆请示，要丈夫连娶了两房妻子：一个姓王，一个姓沈。

If want to install more key word about the product, for instance pink of coconut shell activated carbon, industry not activated carbon, woodiness activated carbon, decolour waits key word a moment to all install 2 class page except carrier of flavour activated carbon, activator, the key word of these products also is not optional setting of course, not be the setting that does not have a truth more, it is hot term of combinative Baidu index and cereal song industry will conclude integratedly.

假如想设置更多的关于产品的要害字，比如椰壳活性炭、工业粉未活性炭、木质活性炭、脱色除味活性炭、催化剂载体等等要害字均设置到二级页面，这些产品的要害字当然也不是随意设置，更不是没有道理的设置，它是结合百度指数和谷歌行业热词等来综合断定的。

Standard configuration is sidle frequency conversion motor drive ; optional configuration is servo motor drive .

标准配置横行变频马达驱动，可选购横行伺服马达驱动。

Also included is their optional long life silver clutch shoes and 16mm big bore shock absorbers along with the suggested springs to suit.

其中还包括他们的任择寿命长银离合器鞋和16毫米大口径减震器与弹簧的建议，以适应。

A firm silver sway bar comes as standard with the kit and an optional softer swaybar is available.

坚定银摇动杆来作为标准，与试剂盒和一个可选的软swaybar可用。

The engine will also be available as a tuned version and will come with a black crankcase, standard version is silver, and a hand modified crankshaft, while all motors will be available in an optional set that includes the manifold, pipe and clutch system.

发动机也将可以作为一个调谐版本，并会与一个黑色曲轴箱，标准版本是银，和一只手改性曲轴，而所有汽车将可在一个可选的设置，包括多方面的，管和离合器系统。

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。