谁知道

No, such rules; I was in my 30's of age, a women in her 30 could be very young from now; my daughter is 30 years age now; remember a poet said to me in his good willing that love poems are quite beyond age of 50, however, poems composing is not my expertise, I write for I have to, nothing wrong with age of 50 either; now, its pretty far from my age of 50; but I still write, no body says one could not write when you re 50 years of age? We can still do that, of cause, something ought to be changed, you feel the time-changing, or agedness.

我那个时候30多岁，30岁现在看很年轻，我女儿现在有30多岁了，那个时候还有诗人跟我说，你到50岁的时候总不能写情诗了吧，他是好意，但是我觉得写诗不是我的专业，我觉得我是要写才写的，我也不知道50岁怎么了，我现在离50岁已经很远了，但是我还在写，谁说50岁不能写，照写，但是有些东西得改变，有一些沧桑。

One can never tell when the weather is going to change, much like the mode of an aimless person.

谁也不知道天气什么时候将要变，天气的变化模式就像一个漫无目的的人。

Do you know who turned the air conditioning on?

你知道是谁把空调打开的吗？

Do you know who Alba's playing with?

你知道 Alba 在和谁玩吗？

I told him that I was going to Taiwan and China both places, and he said,"When you alight from the plane, you will know who your teacher is."

我告诉他，我要去台湾和中国两个地方，他说，"当您下了飞机，您就知道您的老师是谁"。

I'm alive but I don't know who or what I am.

我生活在这个世界上，可我不知道自己是谁。

What is it that my family and I all know but no one ever talks about?

我和家人都知道却谁也没谈论的一件事是什么？

I don't know who you are,but I'll appreciate you all the same.

我不知道你是谁，但是我还是要感激你。

"You do know who Allison is, right?"

"你知道谁是艾莉森对吧？"

Oh, aloha, sir. My name's Henry---l know who you are.

哦，你好，先生，我叫亨利-我知道你是谁

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。