opening

Compared meaning: a hole, gap or space between things (noun).

比较义项：孔洞、缝隙或空隙（名词）。

• opening 本词

  Opening highlights a hole or breach that lets someone or something pass through or see through; it can appear in a single surface (a wall, cloud, fence) without implying two separate things facing each other.

  opening 强调可供人或物穿过或看穿的孔洞、缺口，可以出现在单一表面（墙壁、云层、篱笆）上，不一定意味着两个相对的物体之间。

  The climbers found an opening in the rock face and squeezed through.

  登山者在岩壁上发现一个开口，挤了进去。

• gap

  Gap emphasizes the empty space or distance separating two things that are normally close together, as in a station announcement about a train and a platform; it stresses separation more than passage.

  gap 强调把通常紧靠在一起的两个事物分开的空隙或距离，例如车站广播中提到火车与站台之间的间隙；它更强调“分隔”而非“可通过”。

  Mind the gap between the train and the platform.

  注意火车和站台之间的缝隙。

Both words can mean a space between things, but focus differs. Gap stresses the space separating two things close together. Opening stresses a hole that something can pass through, without needing two facing things. Opening's 'job vacancy' sense and gap's 'difference' sense are not compared.

这两个词都可以指物体上或两者之间的空间，但语气不同：gap 强调把通常紧靠的两个事物分开的间隔或缝隙；opening 强调可供穿过或看穿的孔洞、开口，不一定要有两个相对的物体。这里不比较 opening 的“开业、职位空缺”等义项，也不比较 gap 的“差距、代沟”等义项。

Compared meaning: first, coming at the start (adjective).

比较义项：最先的，开始的（形容词）。

• opening 本词

  The most general and neutral word for something first in a series, used for speeches, scenes, days or sales, with no formality or ceremony implied.

  最通用、最中性的词，指一系列事物中排在最前面的（用于演讲、场景、日子或促销活动），不带任何正式或庆典色彩。

  The comedian's opening joke got the whole audience laughing right away.

  喜剧演员的开场笑话让全场观众立刻笑了起来。

• inaugural

  Formal and official, marking the official start of an organization, era, or public office, such as a speech or ceremony; carries a ceremonial, prestigious tone.

  正式、官方，指机构、时代或公职的正式开端，如演讲或典礼；带有庆典和隆重的意味。

  The president's inaugural speech promised new investment in public schools.

  总统的就职演说承诺加大对公立学校的投资。

• introductory

  Emphasizes preparing an audience or customer for what follows; suggests something basic, preliminary or promotional, common in courses, lessons and sales offers.

  强调为听众或顾客的后续内容做准备；带有基础、初步或促销的意味，常见于课程、课时和优惠活动中。

  New subscribers get a discounted introductory price for the first three months.

  新用户在头三个月可享受折扣的入门价。

• maiden

  Used specifically for the very first attempt, journey or speech by a particular ship, vehicle or person; formal or journalistic, not for routine daily firsts.

  专指某艘船、某辆交通工具或某人“有史以来第一次”的尝试、旅程或演讲；语体正式或偏新闻体，不用于日常琐事的“第一次”。

  The airline's new jet completed its maiden flight without any problems.

  这家航空公司的新客机顺利完成了首次飞行，没有出现任何问题。

All four mean first. Opening is general and neutral. Inaugural is formal, for official ceremonies. Introductory suggests something basic, common in business. Maiden means the first time ever for something, like a maiden voyage. Opening as 'a job' and maiden as 'unmarried' are not compared.

这四个词都表示“最先的、开始的”，但语域和搭配不同：opening 最通用中性，inaugural 正式庄重、多用于典礼，introductory 偏基础铺垫、常见于商业场景，maiden 专指事物或个人的“有史以来第一次”。这里不比较 opening 作名词表示“职位空缺”的用法，也不比较 maiden 表示“未婚女子的”（如 maiden name）的其他用法。