(proverb)something of small or modest proportions may grow into something very large or impressive
(谚)小小橡实可能长成参天大树
(Brit.)(in certain universities) shut the outer door of one's room as a sign that one does not wish to be disturbed
(英)（某些大学中）闭门谢客（指将房门关住表示希望免受打扰）