Backfill
vt. 装填, 回填\\nn. 装填, 回填
🗣️ 情景例句
Because the United States is the most important trade partner.
因为美国是我们最重要的贸易伙伴。
Mr. Green, Mr. Smith is here.
格林先生，史密斯先生在这里。
The reason lies in its gravity.
其原因在于月球的重力。