Sulcus
[医] 沟
🗣️ 情景例句
It's on the house.
这是免费的。
The insect is trapped in the spider's web.
蜘蛛捕捉缠在网上的昆虫。
The dogs have greater freedom, too, for they are allowed to wander outside their enclosure.
狗也比较自由，被放出围栏，四处遛达。