1. The term "sign" refers to indications, symbols, signs, gestures, signposts, signatures, and silent cues. It is primarily used as a noun, but can also function as a verb.2. "Signal," on the other hand, denotes signals, passwords, fuses, flags, and other markers that convey a message or indicate something. It is also used as a noun, verb, and adjective in a sentence.3. The word "sign" is commonly employed in mathematical or physical notation, serving as a symbol to represent concepts or quantities.4. "Signal" is a method of conveying information to a process, much like a building manager slipping a note into a tenant's mailbox.5. He motioned to the waiter to bring the menu. (Original) 他向服務(wù)員示意要菜單。 (Revised)6. The conductor signaled the orchestra to stand up. (Original) 指揮向樂隊(duì)示意讓他們起立。 (Revised)7. Jim signaled his inability to leave the party to Mary. (Original) 吉姆無法離開聚會時，他用眼神向瑪麗示意了無奈。 (Revised)8. She wore a silver peace sign pendant on a chain around her neck. (Original) 她脖子上掛著一條銀質(zhì)和平標(biāo)志項(xiàng)鏈。 (Revised)9. She placed her index finger to her lips as a silent request for quiet. (Original) 她將食指放在嘴唇上，示意大家安靜。 (Revised)10. He presented his wife with a ring as a symbol of his affection. (Original)他用一枚戒指作為愛情的象征送給他妻子。 (Revised)