Line has many meanings, most stemming from the basic idea of something unbroken and often straight. It might be the line you wait in at the market, or just a connection of two points.
The original meaning of line came from the Latin word linea, or “linen thread.” Your career is also your "line of work." Since you're an engineer, you might say "that's not in my line" if you are asked to bake a cake. A "pick-up line" is something you might hear from a person at a party who's flirting with you. It will probably be corny.
1.
a length (straight or curved) without breadth or thickness; the trace of a moving point
2.
a formation of people or things one beside another
3.
a connected series of events or actions or developments
4.
a commercial organization serving as a common carrier
5.
reinforce with fabric
A chain is no stronger than its weakest lining. 一环薄弱，全链不强。
When a different material covers the inside of something, like the clear membrane on the inner layer of an eggshell, you can call it a lining.
Many of our body parts have linings — the stomach lining, for example — that protect their insides. Clothing often contains a protective lining too, like the satin lining of your formal suit or the cotton lining of a sheer skirt, sewn inside, or a furry or plush lining meant to add warmth. A "silver lining" is a happy, bright aspect found in a dark or sad event: "I know there's a silver lining to your car accident!"
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