The p - chlorophenyl isocyanate is synthesised by carbonyl chloride and p - chloroaniline . The yield is 90 %.是什么意思？

The p - chlorophenyl isocyanate is synthesised by carbonyl chloride and p - chloroaniline . The yield is 90 %.

采用光气与对氯苯胺合成对氯苯基异氰酸酯. 收率≥90%.

the

art. 指已提到的人（物），指说话人与听者已知的人（物），用于独一无二的事物前，与形容词最高级和序数词连用；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

isocyanate

n. 异氰酸盐（或酯）；

例句
The p - chlorophenyl isocyanate is synthesised by carbonyl chloride and p - chloroaniline . The yield is 90 %.
采用光气与对氯苯胺合成对氯苯基异氰酸酯. 收率≥90%.

is

vt.& vi. 是（be的三单形式；n. 存在；

例句
Bollinger 'RD' is a rare, highly prized wine.
博林格RD香槟是一种名贵的备受推崇的葡萄酒。

by

prep. 在…旁边，表示方式，由于，经过；adv. 经过，表示保留或保存时用，短暂拜访；

例句
...expensive make-up that we saw being advertised by a beautiful model...
我们所见的由一位漂亮模特代言的昂贵化妆品

carbonyl

n. 碳酰基，羰基；

例句
The surface lipids undergo oxidation, generating many compounds containing hydroxyl and carbonyl groups.
表面的类脂物氧化后, 产生许多化合物,包括羟基和羰基化合物.

chloride

n. 氯化物，〈口〉漂白粉；

例句
Butyraldehyde 1,2 proparediol acetal was synthesized by using stannous chloride as catalyst.
以非质子酸氯化亚锡为催化剂,催化合成了丁醛-1,2-丙二醇缩醛.

and

conj. 和，与，而且，于是，然后，因此；

例句
I spend a lot on expensive jewelry and clothing...
我花很多钱购买昂贵的首饰和衣服。

chloroaniline

n. 氯苯胺；

例句
Isocyanic acid p - chlorophenyl ester was obtained with triphosgene and p - chloroaniline as raw materials.
以对氯苯胺和三光气为原料,合成对 氯苯 异氰酸酯.

yield

vt. 屈服，投降，生产，获利，不再反对；vi. 放弃，屈服，生利，退让，退位；n. 产量，产额，投资的收益，屈服，击穿，产品；

例句
Will she yield to growing pressure for her to retire?...
面对要求其隐退的压力越来越大，她会屈服吗？