4 4 1 2A mothlamp problem, defined by myself yesterday out of boredom, is a particular kind of engineering problem that has three important qualities:
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In 2020 China planted a flag on the Moon on its Chang'e-5 mission
轮至我家时，虽由我爸掌勺，但设计菜单、采买食材、切配帮厨、收拾碗碟均由妈妈负责。通常年前大半个月，她就会拿出一张便签，细细写下预备的菜式和采买清单。