Talweg
深泓线, 最深谷底线
🗣️ 情景例句
Mr. Lu, we are very pleased to be able to offer this product to you.
陆先生，我们很高兴能提供这个产品给您。
You are very justified in your answer.
你的答辩使你的行为的正当性深受认可。
we all rushed to see it.
我们都赶紧跑去观看。