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N - hydroxyethylpyrrolidone ( NHP ) was synthesized from ? ? - butyrolactone and ethanolamine on Y molecular sieve catalyst by two steps.是什么意思？

N - hydroxyethylpyrrolidone ( NHP ) was synthesized from ? ? - butyrolactone and ethanolamine on Y molecular sieve catalyst by two steps.

以改性Y分子篩為催化劑,γ-丁內酯和乙醇胺為原料,采用γ - 丁內酯法兩步合成N - 羥乙基吡咯烷酮 ( NHP ).

was

v. 用來表示某人或某物即主語本身，用來表示某人或某物屬于某一群體或有某種性質（ be的過去式），在，存在，不受干擾；

synthesized

from

prep. （表示時間）從…，（表示原因）因為，（表示來源）來自…，（表示分離）與…分離[隔開]；

butyrolactone

n. 丁內酯；

and

conj. 和，與，而且，于是，然后，因此；

ethanolamine

n. 乙醇胺，氨基乙醇，膽胺；

on

prep. （表示方向）向，（表示對象）對，（表示位置）在…上，（表示時間）在…之時；adv. （放，穿，連接）上，向前，（繼續）下去；adj. 活動著的情況，狀態，使用著的，發生著的，計劃中的；

molecular

adj. 分子的，由分子組成的；

sieve

n. [糧食][礦]篩子，濾網，不能保守秘密的人，嘴不嚴的人；v. 篩，篩選，濾；

catalyst

n. <化>觸媒，催化劑，〈比喻〉觸發因素，促進因素，〈口〉有感染力的人；

by

prep. 在…旁邊，表示方式，由于，經過；adv. 經過，表示保留或保存時用，短暫拜訪；

two

n. 兩個，兩個東西，兩點鐘，一對；adj. 兩個的，我

steps

n. 級別( step的名詞復數 )，腳步，步驟，步伐；v. 舉步，行走，跨步( step的第三人稱單數 )，離開(along)，（尤指馬）輕快地走，（跳舞時）合著節拍走；

...the spiralling vortex airflow that slows the plane.
使飛機減速的螺旋形氣流渦旋

You just go on ahead. I'll come by later...
你只管先往前走。我隨后就來。

He who spares his rod hates his son, But he who loves him chastens him early.
24不忍用杖打兒子的,是恨惡他;疼愛兒子的, 趁早管教.

For further information, please contact 414 3925, extension 2253.
詳情請致電414 3925,轉分機2253。

He sat there while I made the case for his dismissal...
他坐在那兒，聽我陳述解雇他的理由。

Baroness Thatcher's claims seem credible to many.
撒切爾女男爵的主張在很多人看來是可信的。

Nothing to be got without pains but poverty.
一份耕耘，一份收獲。

This decree obliges unions to delay strikes.
該法令迫使工會推遲罷工。

The right to demand payment from the endorser of a commercial paper when the first party liable fails to pay.
追索權當有支付義務的第一方不能支付時，可以向商業票據的背書人要求支付的權力。

Usumbura was renamed Bujumbura when Burundi became independent in 1962.
布隆迪年獨立后烏松布拉改名為布瓊布拉.

Objective To evaluate the clinical effects of butorphanol preemptive analgesia on brachial plexus block with ropivacaine.
目的評價布托啡諾超前鎮痛對羅哌卡因臂叢阻滯效果的影響.

Its main components include propane, butane and butylene.
主要成份是丙烷、丁烷、丁烯等.

It is a very pretty butterfly, with a 2 inch wing span.
這是一只非常美麗的蝴蝶，翼展2英寸。

Artificial incubation and growth observation for the nestlings of Great Bustard ( Otis tarda )
大鴇人工育雛及雛鳥生長發育的研究 ( 英文 )

Did you manage to speak to the bursar about my salary?
關于我的薪金問題,你是否已經向會計疏通過?

He had bursitis, but they pretended he was in perfect health.
他患有黏液囊炎, 但他們佯稱他身體極好.

I think the chief thing that struck me about Burton was his kindliness.
我想,我對伯頓印象最深之處主要還是這個人的和善.

The president's tough line is, however, buttressed by a democratic mandate.
然而，總統推行的強硬路線受到了民主黨發布的訓令的支持。

Do you have buttermilk, or should we stop by and pick some up on the way?
你家里有酸乳嗎 ?還是我們在路上捎點兒?

The painter spent busman's holiday painting his own house.
這個油漆匠以油漆自己的房屋來度過假日.

The buttercup is a wild plant with bright yellow cup - shaped flowers.
毛茛是一種野生植物,開杯形黃色花.

Formisano, Ronald P . Boston Against Busing: Race, Class, and Ethnicity in the 1960 s and 1970 s . 1991.
《波士頓反對公車系統: 1960年代和1970年代的種族、階級與族群》1991.