既然的英文：
since
as
this being the case
now that

参考例句：

With your head for figures, you should go in for accountancy.
既然你善于计算，就应从事会计工作。

Don't you want me to varnish your toe-nails since you've had a pedicure?
既然修了脚趾甲，是否要涂亮趾甲呢?

As there's no cream,we'll have to content ourselves with black coffee.
既然没有奶油,我们只好喝清咖啡算了.

Don't be such a dog in the manger. Lend your Bicycle to him since you will not go out this afternoon.
别这么不够朋友,既然你今天下午不出去就把自行车借给他用一用

The winter solstice having stealthily come on, the lowness of the sun caused the hour to seem later than it actually was
冬至既然已经人不知鬼不觉地就来到了，所以低低的太阳，就把实在还早的时光弄得仿佛已经很晚了。

If you’re so down on mothers-in-law, it’s queer you’re anxious to be one yourself. The expectant mother-in-law!
你既然这么瞧不起婆婆，你自己又急于要做婆婆，这就怪了。你还是一位候补婆婆呢！

Now that Lucille and hob have had that little heart to heart talk, may we have another word, hob?
既然露西尔和霍布已经推心置腹地谈了话，那么霍布，我们可不可以说另一个词呢？

Well, if you insist.
好吧，既然您坚持这样。

Why use wood when you can use plastic?
既然能用塑料，何必非用木料？

I will not keep a dog and Bark myself
既然养了狗,何必自己叫

being是什么意思：
n. 生物；存在；本质
adj. 存在的；现有的

The act or process of bringing or being brought into being
使某事物开始存在或成为现实的动作或过程

This program is being broadcast in stereo.
这个节目正用立体声播放。

For West Asians, being kept
对西亚人来说，

She is tired of being in the spotlight.
她厌倦到处抛头露面。

Being authentically or genuinely such by birth.
纯种的出身纯正或血统纯净的