We may take a chance on her being at home.也许碰巧她在家.I met her by chance on the street.我恰巧在街上遇到了她.You take a chance on the weather if you holiday in the UK.在英国度假，只有赌天气了。...
这些参数导致了特定固定相的分离行为.These parameters contribute to the chromatographic behaviour of a particular stationary phase.方法使用薄层色谱法, 以硅胶 GF254 为固定相.Methods: TLC method was applied , the stationary phase was GF _ ( 254 ).考察了一些手性化合物...
an infrequent guest稀客Some words are too infrequent to be worthy of inclusion in the dictionary.一些单词的使用频率太低，没有必要收入词典。Barriers between nations are reared by slow and infrequent communication.国与国之间的隔阂是由沟通缓慢而又太少形成的....John&#...