Protection against chickenpox is offered in a new, combined vaccine called MMRV which will replace MMR. This combined jab helps protect against measles, mumps, rubella and varicella (chickenpox).
A. Preprocessing (Done by OsmAnd when new maps are prepared):
，这一点在51吃瓜中也有详细论述
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if (currentStep.type === 'Command') {