inner、inside、interior、internal与inward这些形容词均含“内部的、内在的”之意。
inner : 含义广泛，指事物中心或接近中心的部位，也可指内心隐密的活动。
- Leading off the main hall is a series of small inner rooms.
从主客厅开始是一系列小的内室。 - Few people ever managed to penetrate the director's inner sanctum (= very private room).
很少有人进过经理的私人密室。 - Sarah seemed to have a profound sense of inner peace.
萨拉内心好像非常平静。
inside : 多指处于某物内部或靠近内部，常可与inner换用，可引申指内幕的，秘密的。
- "Is Anna in the garden?" "No, she's inside (= in the house)."
“安娜在花园吗？”“不，她在屋里。” - What's inside the box?
盒子里面是什么？ - Luckily, no one was inside the building when it collapsed.
幸运的是，房子倒塌时里面没有人。 - She couldn't cope with the grief she felt inside.
她无法承受内心的悲伤。 - Who can tell what goes on inside his head?
谁知道他脑袋里想的是什么？ - He put the documents carefully in his inside pocket (= pocket on the inside of a jacket or coat).
他把文件小心翼翼地放进外套内层的口袋里。
- inside information/knowledge
内部消息／内情 - I'll call up Clare and get the inside story (= a true report of the facts).
我将给克莱尔打电话了解内幕。
interior : 指某物的内部，尤指某物的内侧；也可指内地的或国内的。
- The interior walls have patches of damp on them.
内墙上有片片湿斑。 - The paintwork on the interior doors (= those not in the outside wall of a building) is in good condition.
室内门上的漆面保持完好。 - France's interior minister
法国内政部长
internal : 书面用词，医学上多用，指事物的内部，也可指国内的或内政的。
- He sustained injuries to his arms, legs, and several internal organs.
他的手臂、腿和一些内脏都受了伤。 - The bank conducted its own internal investigation into the robbery.
银行针对抢劫案进行了内部调查。 - The government warned its neighbours not to interfere in its internal affairs.
该政府警告邻国不要干涉其内政。
inward : 指朝着中心或内部方向的，侧重方向而不是位置；也可指内心的隐密活动。
- The force pushes the object in an inward direction.
这股力量将物件向内推进。 - inward feelings
内心的感受
