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就 and 才 are used to show when an action is earlier/ smoother/ easier than expected, or when an action is later/ more difficult than expected (respectively). They are both adverbs, so come just before the ver...

的 is a possessive or descriptive particle - this means that it marks out a relationship between two nouns, or between an adjective and a noun. For example, 他 的 姐姐 (his sister); or 快 的 车 (a fast car). 得 is al...

The current is the rate of flow of charge. It is a measure of how many electrons pass a point over a certain amount of time. We measure current using an ammeter which gives current in Amps. Current is usuall...

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Chromatography separates components in a mixture according to their solubility in the mobile phase and their adsobance to the stationary phase. The mobile phase is the part of the chromatography set up that ...