Harvest Model and Its Stability Analysis for the Population of a Single Race with Age Group

The population of the adult dairy cow is 400 for each designing farm;

奶牛场的规模为成乳牛400头的牛场一座；

The population of the Hakka accounted for only about 10 per cent of the total population of Penang Chinese.

客家人的人数，一直都只占华人人口的10%左右。

China is really between a rock and a hard place when it comes to its water sector.

在谈到水这个问题时，中国确确实实成了一个不好的地方。

The third act throws in more obstacles to place the protagonist between a rock and a hard place and then resolves all of the outstanding issues.

最后一幕则设置更多的障碍，将主角置于困境之中，并在最后解决所有的重大问题。

You were really between a rock and a hard place when you had to choose between your career and your relationship.

当你不得不在事业和感情之间做出选择时，真的是进退两难。

When you are stuck between a rock and a hard place, sometimes you have to choose the hard place.

当你被卡在岩石与硬壁之间，有时候你不得不选择硬壁。

Since my mother and my wife were at war with each other, I was stuck between a rock and a hard place.

自从我妈妈和我老婆彼此不合，我就被卡在中间，两面不讨好。

Neither option is good; I'm between a rock and a hard place.

两个选项都不好，我现在进退两难。

You are caught between a rock and a hard place.

你处在between a rock and a hard place的境地。

Caught between a rock and a hard place.

在一块岩石和一个险要的地方之间被捉住了。

China, even with its legendary efforts to offset capital inflows with purchases of dollar assets, is now caught between a rock and a hard place.

即便是素以购买美元资产来抵消资本流入而著称的中国，目前也陷入了两难的境地。

But the show is actually named after a supporting player-Mr Robot-the mysterious leader of an underground hacking collective who recruits Alderson to destroy the company he is paid to protect, putting him between a rock and a hard place.

不过，这部剧却用一个配角的名字作为片名。罗伯特先生（Mr.Robot）是一个神秘的地下黑客组织的首领，他招募了奥尔德森，让奥尔德森摧毁雇佣自己的公司，这也让奥尔德森陷入了困境。

Another expression for having no real choice is between a rock and a hard place.

另外一个表示没有任何选择的短语是between a rock and a hard place。

I come here with great reluctance. I am between a rock and a hard place.

我是十分勉强地到这里来的。我现在是进退两难。

I couldn't make up my mind. I was caught between a rock and a hard place.

我下不了决心，陷入了进退维谷的境地。

but my tail was stuck between a rock and a hard place.

但是我的尾巴被一块石头卡住了

You've put me between a rock and a hard place.

你将我陷入了进退两难的境地。

I'm caught between a rock and a hard place.

我进退两难。

And that means users are stuck between a rock and a hard place.

这意味着用户陷进左右为难的境地。

Women are stuck between a rock and a hard place, when it comes to asking for more money.

女性在开口谈更多薪水的时候常常处于尴尬的位置。