Legally
“Legally” 由 legal（法律的、合法的）+ -ly 构成，修饰动词或整句，表示 依照法律 或 具有法律效力。反义概念常用 illegally。
- “You must be eighteen to buy it legally.” (你必须年满十八岁才能合法购买。)
- “The contract is legally binding once both sides sign.” (双方签字后合同即具有法律约束力。)
- “They were advised to register the business legally.” (他们被告知应依法注册公司。)
leg- 来自拉丁语 lex/legis（法律），与 legal、legislate、legitimate 同源。
leg- + -al（形容词）+ -ly（副词）→ legally。
新闻、商务邮件中 legally required、legally responsible 很常见，强调 合规 而非道德评价。
- 固定搭配: “legally binding” (有法律约束力的), “legally responsible” (负法律责任), “legally married” (合法结婚)
legal（法律的）+ ly → 做事要 “按法律那条线走”。
“They wanted to expand quickly, but their lawyer insisted everything be done legally before they opened a second store.” (他们想快速扩张，但律师坚持第二家店开业前一切都要合法办理。)