專業(yè)英語中的常見語法現象分析-wenkub
2023-04-21 07:45:27 本頁面
【正文】 ter.The use of IPNs has received a great deal of attention in recent years and different kinds of IPNhave been synthesized with different positions.The major amount of work on size distributions has been on polyesters and polyimides.A sizeable amount work has been published on the copolymerizations of various cyclicmonomers.以下結構的謂語的數由前一個決定, as well as……由較靠近謂語動詞的決定not only……but also……either……or……neither……nor……◆ 當含意上強調復數時建議用復數。另外在文章的開頭和結論部分有事也使用we，如in this paper, we report…或者we concluded that…等時態(tài)主要使用三種時態(tài)：一般現在時，一般過去時和現在完成時(1) 在敘述一般的科學原理、公式推導、計算過程和結論時，常用一般現在時；如當提到本文、此圖、此表等說明了、表達了什么時This paper describes ……The focus of this paper is ……Figure 1 shows ……Most of the mon condensation polymers are listed in Table 11.(2) 在敘述某種實驗操作、試劑配制時，常使用一般過去時；例如：Novozym435 ( g) was suspended in 25 mL of nanopure water in a 100 mL roundbottomed flask fitted with a water cooled condenser. The lipase suspension was refluxed for 14 h. The suspension was then allowed to cool to room temperature, and water was removed by freeze drying…. The reaction vials were capped tightly and shaken vigorously for a few minutes. Thereaction vials were then placed in a constanttemperature water bath maintained at 37176。C for 3h with magnetic stirring….(3) 在敘述已經發(fā)生的并且延續(xù)到現在的事情時使用現在完成時，如描述研究進展使用In recent years作時間狀語時，通常使用完成時In recent years, Plesch and coworkers have concluded that many socalled cationic polymerizations do not proceed through intermediates of an ionic nature.時態(tài)是個比較復雜的問題雖然有一般的規(guī)則但往往在實際文章中很難把握，需要注意的是在同一段落中要避免時態(tài)跳躍。The catalyst concentrations for the different reactions are different.Our research focuses on the syntheses and characterizations of a series of polycarbonates with different chemical structures.The physical and chemical properties of this pound have been studied.The chain lengths of the oligomers with different molecular weights are different.當含意上不強調復數時可用單數或復數。以下是在學術文章中通常視為可數名詞的單詞：但在一般字典中它們或它們做某種含義解時可能被劃歸不可數名詞。C.Fig. 8 Dependence of the ease of cyclization on the size of the ring.☆ 具體的化學藥品、化學物質前通常不加冠詞：The polymer
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