很大的

So this came to China 30 years produce very big change at a heat.

所以这一口气30年来中国发生了很大的变化。

I certainly learned my lesson, but at a very high price.

我的确学到了教训，但是付出了很大的代价。

Now, he is making an important contribution at the end.

现在，在赛季末他为球队作出了很大的贡献。

Those tribes are multiple and sometimes operate at cross purposes, so figuring all that out is going to be much more of a challenge.

那些部落结构复杂，时常各自为政，因此要想把它们一一琢磨透彻是很大的挑战。

I have a lot of pressure at work .

我在工作上有很大的压力。

I'm under a lot of pressure at work.

我在工作上受到很大的压力。

Ti-Si composite materials are mixed at atomic scale, and Ti-O-Si bond appears in all of the samples with different TiO2 content; the mixed oxides are mainly existed in the form of amorphous pattern, anatase appears when the TiO2 content is more than 80%, but compared with the intension of pure TiO2, it has not integrate structure. The acetic content has great influence in the specific area and crystal structure of the mixed oxides. 20TiSi has good heat stability, still possesses 11m2/g after calcined at 1100℃; calcinations on the large scale of temperature does not cause the break of Ti-O-Si bond, TiO2 is well dispersed in 20TiSi calcined at 1100℃, and it still existed in the form of amorphous.

结果表明：制得的Ti-Si复合氧化物具有很高的比表面积，在TiO_2含量为10％时达到681.5m~2／g，Ti原子进入Si-O四面体结构中，形成Si-O-Ti键，复合氧化物的稳定性好，当TiO_2含量低于60 wt％时，以无定型形式存在；当含量为80％时，出现锐钛矿型TiO_2，但与纯TiO_2相比晶型不完整：醋酸对Ti-Si复合氧化物的比表面积、晶型都有很大的影响；TiO_2含量为20％的20TiSi经1100℃高温焙烧后，仍有较高的比表面积(11m~2／g)，稳定性好，在较宽的温度范围内焙烧，没有引起Ti-O-Si键的断裂，分散度高，没有出现晶型TiO_2。

I like this one :Happiness is attainable.

幸福是一个很大的选择。

He didn't pass the exam, but it was a good attempt.

他虽然没有通过考试，但他做了很大的努力。

It has been a drastic change from autocracy to democracy.

从专权政治到民主政治，确实有很大的改变。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。