英语翻译exchange of proximity switch against light curtain请问这里against是什么意思?

英语翻译皮亚杰理论：schemes；assimilation and accommodation；equilibration；Sensorimotor stage；conservation；Reversibility；concrete operational stage；Formal operational stage；维果斯基理论：cultural settings；Zone of Prox 英语翻译Departed From OutWard office of exchange to - HONG KONG 英语翻译Your brief report must clearly show the effects of the exchange rate movement and the effect of foreign exchange risk cover as an exchange risk management tool. Bill of exchange上的exchange for exchange of students bill of exchange是什么意思 settlement of exchange是什么意思 exchange for 和 exchange off 的区别exchange of 英语翻译期货贸易里面的seat holder of the exchange的席位怎么翻译? 英语翻译exchange of proximity switch against light curtain请问这里against是什么意思? exchange of goods for money 英语翻译explain with an example one of the economics effects of a depreciation of the dollar on foreign exchange markets in exchange of和in exchange for有何区别? Exchange rate regimes and the price of exchange rate risk exchange exchange Exchange 英语翻译This kind of consideration is valid when the exchange of promises between two parties will be carried out later.In contrary,executed consideration is not valid until the exchange of consideration between two parties is carried out.