对...必不可少

Is necessary and important to our country's development and construction.

……对我们国家的发展和建设是必不可少的，非常重要的。

Is necessary and important to our country development and construction.

对我们国家的发展和建设是必不可少的，非常重要的。

Chemical nitrogen fertilizer applied was an absolutely necessarily technical and measure in red soil region for the purpose of improving quality of corm and wheat. The impact of chemical nitrogen fertilizer on quality of corm and wheat was better than that of organic nitrogen fertilizers.

为提高红壤旱地玉米和小麦子粒的品质，使用化学氮肥是一项必不可少的技术措施，同时化学氮肥对玉米和小麦子粒品质提高效果大于有机氮。

However love and conviction are the melody of life, but it is necessary to have to the deliberation of life meaning.

然而爱。信念是人生的旋律，但对人生意义的思索也是必不可少的。

Compared with classical cytotoxic T lymphocytes , NK cells are superior in the following aspects: NK cells are among the first cell types to be activated after intracellular pathogen stimuli, the activity of NK cells peaked between 1 to 3 days, retained during the first 7-10 days, and the T cells response emerged only after 7 days when the NK cell responses begin to decline; though comprising of only 10％-15％ of peripheral lymphocytes, NK cells mobilize most of the cell populations in a strong and high level response to different invasions, and act as key factors at early defense before a specific immune response could mount, while only certain clones were involved in T cell response; NK cells kill virus-infected or malignant transformed cells without pre-sensitization and without restriction by major histocompatibility antigen, which is usually a mechanism of immune escape to T cell recognition by virus-infected or tumor cells, thus NK cell in complementary with T cells play crucial roles in tumor and virus eradication.

NK细胞以其强大的细胞毒活性为特征，与细胞毒性T细胞相比，NK细胞具有如下特点：NK细胞虽然只占外周血淋巴细胞的10-15％，但是对刺激性因素产生应答的过程十分迅速，一次可以调动大多数细胞共同参与，而不是几个克隆的活化，免疫应答的强度高；病毒感染或恶性转化细胞的一个主要特征是细胞表达的MHCⅠ类分子下降或消失，并借助这一机制逃避特异性T细胞应答的识别，NK细胞介导的杀伤活性无需抗原刺激，不受MHCⅠ分子表达的限制，从而与T细胞应答互为补充发挥免疫防御的功能；NK细胞的免疫活性可以被多种细胞因子上调，其中IFNα，IL-2，IL-12，IL-15和IL-18具备更强的作用；NK细胞具有强大的细胞因子分泌功能，对于启动T细胞特异性应答必不可少。

Money is essential to everyone's life.

钱对每一个人都是必不可少的。

Anti-terrorism robot system is mainly used to detect, eliminate and dispose bomb or other dangerous exploder. In additon, it can be used for lauching attack to rodman and terrorist. It is not only the essential equipment in anti-terrorist army, but also widely used in succor and battle.

反恐机器人系统主要用于代替人工，直接在案发现场进行侦察，排除和处理爆炸物以及其他危险品，也可以对持枪的恐怖分子及犯罪分子实施有效攻击，是反恐部队中必不可少的重要装备，同时也广泛应用于救援以及作战平台领域。

Effective flood control is not only necessary, but is also essential for protecting the lives of millions of

有效地控制洪水不仅是必要的，而且对保护数百万中国公民的生命来说是必不可少

Effective flood control is not only necessary , but is also essential forprotecting the lives of millions of Chinese citizens .

有效地控制洪水不仅是必要的，而且对保护数百万中国公民的生命来说是必不可少的。

Effective flood control is not only necessary , but is also essentialfor protecting the lives of millions of Chinese citizens .

有效地控制洪水不仅是必要的，而且对保护数百万中国公民的生命来说是必不可少的。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。