一：under-the-counter是指非法或不公开的交易或活动，通常指在法律规定的范围之外进行的交易或活动。

用法：这个短语通常作为形容词使用，修饰名词，表示某种交易或活动是非法或不公开的。

例句：

1. The store owner was arrested for selling under-the-counter goods.

（这位店主因为销售非法商品而被捕。）

2. The company was accused of under-the-counter dealings with foreign investors.

（这家公司被指控与外国投资者进行非法交易。）

3. The politician was involved in under-the-counter activities to fund his campaign.

（这位家参与了非法活动来筹集竞选资金。）

4. The black market is known for its under-the-counter transactions.

（黑市以其非法交易闻名。）

5. Many people are willing to pay extra for under-the-counter products because they are hard to find.

（许多人愿意为非法产品支付额外费用，因为它们很难找到。）

二：怎么读（音标）：/ˈʌndə ðə ˈkaʊntər/

三：用法：under-the-counter通常用于描述一些违反规定、不公开的交易或活动，包括但不限于贩卖假货、、等。

四：例句1-5句且中英对照：

1. The company was fined for engaging in under-the-counter activities.

（这家公司因为从事非法活动而被罚款。）

2. The government has been cracking down on under-the-counter dealings in the country.

（一直在打击该国的非法交易。）

3. The police discovered a large amount of under-the-counter money during the raid.

（在突击搜查中了大量的非法资金。）

4. He was arrested for trying to sell under-the-counter drugs to high school students.

（他因为试图向高中生贩卖非法药物而被逮捕。）

5. The politician's hidden wealth was a result of his under-the-counter dealings with foreign investors.

（这位家的隐秘财富是与外国投资者进行非法交易的结果。）

五：同义词及用法：under-the-table、black market、illegal、unlawful等都可以用来表示非法或不公开的交易或活动。

六：编辑总结：under-the-counter是一个常用于描述违反规定、不公开的交易或活动的形容词，它通常带有负面含义，指涉一些违反道德和法律规定的行为。在使用时需要注意语境，避免误解。