Underclassification
降低货物等级
🗣️ 情景例句
Alright. Please sit down.
好的，请坐下。
The data confirm that this product is safe and effective.
数据证实此种产品安全有效。
They spent a full and very enjoyable morning together, and Fred discovered that he had a gift for making a visit interesting and lively.
他们一起度过了一个充实而又非常愉快的早上，弗雷德发现自己具有导游的才能，能使参观活动变得趣味盎然。