地下開採 — de xià kāi cǎi

1

de

earth, ground, soil; land, region; structural particle used before a verb / below, underneath; inferior; to bring down; next / to open; to start, to initiate, to begin / to collect, to gather; to pick, to pluck

2

xià⁴

earth, ground, soil; land, region; structural particle used before a verb / below, underneath; inferior; to bring down; next / to open; to start, to initiate, to begin / to collect, to gather; to pick, to pluck

3

kāi¹

earth, ground, soil; land, region; structural particle used before a verb / below, underneath; inferior; to bring down; next / to open; to start, to initiate, to begin / to collect, to gather; to pick, to pluck

4

cǎi³

earth, ground, soil; land, region; structural particle used before a verb / below, underneath; inferior; to bring down; next / to open; to start, to initiate, to begin / to collect, to gather; to pick, to pluck

As word