封(ふう)筒(とう) fuutouに niもう mou1 1枚(まい) mai切(きっ)手(て) kitteを oはり hariなさい nasai。 Put one more stamp on the envelope. Literal Envelope [target-に] more one-sheet stamp [object-を] stick. もう1枚 means 'one more (flat object).' 枚 is the counter for flat objects like stamps, paper, and sheets. stationery~なさい (polite imperative)
封(ふう)筒(とう) fuutouに niもう mou1 1枚(まい) mai切(きっ)手(て) kitteを oはり hariなさい nasai。 Put one more stamp on the envelope. Literal Envelope [target-に] more one-sheet stamp [object-を] stick. もう1枚 means 'one more (flat object).' 枚 is the counter for flat objects like stamps, paper, and sheets. stationery~なさい (polite imperative)