?Illegal一詞來自拉丁語“illeglis”，意思是不合法的。它可以用作形容詞，也可以用作名詞。

作為形容詞，illegal指違反法律或社會規范的，的，非法的。它通常用于描述某種行為、活動或物品是否符合法律規定。：

1. It is illegal to drive without a license.（沒有駕照是的。）

2. The company was fined for illegal dumping of waste into the river.（該公司因非法向河流傾倒廢物而被罰款。）

3. The sale of cigarettes to minors is illegal in many countries.（許多向未成年人出售香煙。）

作為名詞，illegal指非法移民或非法居留者。這個詞通常用于描述那些沒有合法身份居住在某個的人。：

1. The government is cracking down on illegal immigrants.（正在打擊非法移民。）

2. He was arrested for being an illegal and deported back to his home country.（他因為是非法移民被逮捕并被遣返回自己的祖國。）

除了以上兩種常見的用法外，illegal還可以表示“不合理的”、“不道德的”等含義。：

1. It is illegal for employers to discriminate against employees based on their race or gender.（雇主因種族或性別歧視雇員是不合理的。）

2. The use of child labor in factories is illegal and unethical.（在工廠使用童工是不合理的，也是不道德的。）

總的來說，illegal一詞通常用于描述、違規或不道德的行為，它與法律和社會規范密切相關。

用法：

1. It is illegal to drink and drive.（酒后駕車是的。）

2. The government has declared the sale of ivory illegal.（已宣布象牙交易為非法。）

3. The company was fined for illegal business practices.（該公司因非法經營行為被罰款。）

例句參考：

1. The police arrested several people for engaging in illegal gambling activities.

（逮捕了幾個從事非法活動的人。）

2. Many countries have strict laws against the possession of illegal drugs.

（許多都有嚴格的法律擁有非法藥物。）

3. The company was accused of hiring illegal immigrants as cheap labor.

（該公司被指控雇傭非法移民作為廉價勞動力。）

4. It is important for citizens to report any illegal activities they witness to the authorities.

（公民應該向舉報他們目睹的任何非法活動。）

5. The environmental organization is fighting against the illegal logging of rainforests.

（環保組織正在與非法砍伐雨林作斗爭。）