不可缺少

Joachim reassured him that he was needed.

乔基姆让他放心，说他是缺少的。

Sorcerer and witch doctor,grigri and juju,are still an integral part of the African pattern.

巫师和巫医，护符和物神仍都是非洲型缺少的部份。

Water is indispensable to plants.

水是植物缺少的。

He is indispensable to our work, we cannot do it without him.

对于我们的工作来说, 他是缺少的, 有他, 我们就做了。

With the mobile and flexible feature, high definition rediffusion system would be very important equipment applied by people.

转播车作为灵活、机动的演播室,是电视台缺少的备。

L-arginine is an imperative ingredient and material in producing compound amino acid injecta and composing other medicines.

精氨酸是生产复方氨基酸注射液缺少的成份，也是进一步合成其它药物的氨基酸原料。

The ash matter of coal is one of main effect factors in various coal researches.In this paper, five methods of acid washing to deash coal were studied.

在对煤优化转化的各类研究中,灰分是缺少的影响因素之一。