自底向上 zì dǐ xiàng shàng

DEFINITIONS

  1. bottom-up

CHARACTERS

自 zì
HSK 3
self, private, personal; from
底 dǐ
HSK 4
bottom, underneath, underside
向 xiàng
HSK 3
toward, direction, trend
上 shàng
HSK 1
top; superior, highest; go up, send up