Three years earlier, researchers in Britain reported that combining streptomycin with a newer medicine, para-aminosalicylic acid, could reduce the development of drug resistance.
三年前，英国研究者报告将链霉素和另一种更新的药物——对氨基水杨酸联合应用可以减少耐药性的发生。
The strong acid is the active site for creaking para-diethylbenzene and ethylbenzene and it has little effect on p-isomer selectivity of disproportionation and isomerization.
强酸位是对二乙苯和乙苯裂化的活性中心，而对歧化和异构化反应生成对位异构体的选择性影响不大。
Catalytic nitration of toluene occurs by use of nitric acid in the presence of bentonite metal nitrates with useful para selectivities, up to a para to ortho ratio 1.0.
在皂土硝酸盐催化下，甲苯能被浓硝酸对位选择性硝化，对邻硝化产物比率达1．0以上。
At the same time, boride thus formed covered the surface acid sites and blocked the pores and channels, leading to higher para-selectivity.
同时，硼化物覆盖了表面酸中心，堵塞了孔道，因而提高了反应的选择性；
At the same time, boride thus formed covered the surface acid sites and blocked the pores and channels, leading to higher para-selectivity.
同时，硼化物覆盖了表面酸中心，堵塞了孔道，因而提高了反应的选择性；
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