不可缺少

Joachim reassured him that he was needed.

乔基姆让他放心，说他是不可。

Water is indispensable to plants.

水是植物不可。

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态不可部份。

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

对于我们工作来说, 他是不可, 有他, 我们就做不了。

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

转车作为灵活、机动,是电视台不可重要设备。

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不可成份，也是进一步合成其它药物重要氨基酸原料。

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.

在对煤优化转化各类研究中,灰分是不可影响因素之一。