Alluviation
沖積; 沖積作用
??? 情景例句
Please sit down, Mr. Stewart.
請(qǐng)坐， Stewart先生。
No safe wading in an unknown water.
未知水深淺，涉水有危險(xiǎn)。
He is respectful to his elders.
他對(duì)長(zhǎng)輩很恭敬。