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The lighter version used liquid hydrogen, the heavier used hypergolic propellants.较轻的推进器采用液态氢, 较重的采用自燃推进剂.Pressure - fed engines are particularly susceptible to dissolved gas in the propellants.挤压 式 发动机对推进剂中溶解的气体特别敏感.Thi...

prolong的现在完成时为：prolonged...

project的复数形式为：projects...

prompt的第三人称单数（三单）为：prompts...

n.黄素蛋白...

prosecute的一般过去时为：prosecuted...

prodigal son的音标：prodigal son的英式发音音标为：['prɔdɪgəl sʌn]prodigal son的美式发音音标为：['prɑdɪɡəl sʌn]...

adj.可能的，大概的n.很可能的事，可能入选者...

prophecy的近义词/同义词有：augury, dowsing, soothsaying, crystal-gazing, palmistry, palm-reading, divination, astrology, fortune-telling, prediction, prevision, prescience, foresight, presentiment, foretelling, precognition, sigh...

proper的近义词/同义词有：perfect, accurate, faultless, respectful, right, decent, correct, fitting, tasteful, apt, allowable, adapted, desired, formal, true, righteous, equitable, acceptable, perfect, pure, applicable, decent, ac...

produce的第三人称单数（三单）为：produces...

n.支柱，支撑物，支持者，后盾，靠山，道具，（橄榄球中的）支柱前锋vt.支撑，支持，维持，使倚靠在某物上...

protector的音标：protector的英式发音音标为：[prə'tektə(r)]protector的美式发音音标为：[prə'tɛktɚ]...

programme的现在完成时为：programmed...

program的复数形式为：programs...

provoke的音标：provoke的英式发音音标为：[prə'vəʊk]provoke的美式发音音标为：[prə'voʊk]...

profess的音标：profess的英式发音音标为：[prə'fes]profess的美式发音音标为：[prə'fɛs, pro-]...

profligate的音标：profligate的英式发音音标为：['prɒflɪgət]profligate的美式发音音标为：['prɑflɪgət]...

n.礼仪( protocol的名词复数 )，（外交条约的）草案，（数据传递的）协议，科学实验报告（或计划）...

We must keep a sense of proportion about all this.我们对所有的这些都要有轻重缓急之分。A substantial proportion of the population speak a French-based patois.人口中有一大部分说以法语为基础的混合语。The proportion of women in the profession had risen to 17.3%....

Rabbits proliferate when they have plenty of food.兔子有充足的食物就会繁衍得很快.There is a natural tendency for services to proliferate.各种服务大量产生就成为一种自然的趋势.Fantasies proliferate where factsare few.事实缺乏则幻想增多....

They have begun dialogues to promote better understanding between both communities.双方已经开始了对话，以增进两个社群间的彼此了解。It's simply unethical to promote and advertise such a dangerous product.宣传推广如此危险的产品完全是不道德的。She refused to pr...

promenade的音标：promenade的英式发音音标为：[ˌprɒmə'nɑ:d]promenade的美式发音音标为：[ˌprɑmə'neɪd]...

prosperity的复数形式为：prosperities...

adj.深厚的，意义深远的，严重的，知识渊博的n.〈诗〉深海，大洋，深渊，（灵魂）深处...

I proffer to help him.我愿意帮助他.His proffer of advice was not accepted finally.他所提供的建议最后没被采纳.Proffer to help sb.表示愿意帮助某人....

approbation的音标：approbation的英式发音音标为：[ˌæprə'beɪʃn]approbation的美式发音音标为：[ˌæprə'beʃən]...

I fear that a land war now looks very probable.恐怕陆地战爆发的可能性很大。The probable outcome of the talks is a compromise.会谈的结果很可能是妥协.It is hardly probable that he will succeed.他不会成功....

protruding的音标：...