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Both particles are used to signify the past tense of a verb, but they signify different types of past tense (which we don't really have in English). 过 is used when to convey the action has been experience...
The myelin sheath is a fatty substance which surrounds and insulates neuron axons (i.e. it does not allow potassium or sodium ions to pass through it), which allows fast propagation of action potentials a...
The mens rea requirement of a crime is the mental element part. For example, having the intention or knowledge of the wrongdoing. Differently, the actus reus element is the conduct part of the crime, for ...
3a = 6i + 9j
-b = -4i + 2j
3a-b = (6i-4i) + (9j+2j) = 2i + 11j
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