Backstitch
n. 回式针迹\\nv. 用回式针迹缝
🗣️ 情景例句
My account number is ...
我户头号码是…
How much is it by air mail?
航空信要多少钱？
and we know something of the great variety of the sea bed's topography.
而且我们对海底地形的千变万化也有了一定的了解。