密封

• ピンイン: mì fēng
• 漢字の分解: 密 = 宀 (roof/cover) + 必 (must, phonetic) — airtight, close; 封 = 土 (earth) + 寸 (inch) — to seal, to close off

意味

密封する（気密・液漏れしないよう完全に封じる）

Used in engineering, food preservation, laboratory science, and legal/official contexts (sealed documents or envelopes). Implies complete closure with no permeability. Distinct from 封闭 (closed off) in that 密封 specifically emphasises the airtight or impermeable nature of the seal.

例文

1. 食品加工厂采用真空密封技术来延长产品保质期，同时有效防止细菌污染和氧化变质。
2. 这批考卷必须在密封的信封中保存，任何拆封行为都将被视为严重违规，相关人员将承担法律责任。
3. 实验室要求所有化学试剂在使用后立即密封储存，以防止挥发性气体扩散，确保操作环境的安全。

使い方ガイド

場面: engineering, food industry, science, legal, logistics

トーン: neutral

正しい言い方

• 该型号的潜水设备采用了多层密封结构，即使在水下三百米的高压环境中，也能确保内部精密仪器的正常运作。(This model of diving equipment uses a multi-layer hermetic sealing structure that can ensure the normal operation of precision instruments inside even in the high-pressure environment three hundred metres underwater.)
• 药品监管部门规定，所有出厂药品必须经过密封检测，任何包装存在微小缺陷的批次一律不得流入市场。(The pharmaceutical regulatory authority stipulates that all outgoing medicines must undergo sealing inspection; any batch with even a minor packaging defect must not be allowed onto the market.)

避ける言い方

• 将'密封'与'关闭'或'封锁'混用 — 密封强调不透气、不渗漏的物理状态，描述一般性的关闭或封锁应用'关闭''封锁'或'封存' (Do not confuse 密封 with 关闭 or 封锁 — 密封 emphasises an airtight, impermeable physical state; use 关闭, 封锁, or 封存 for general closure or blockage)

起源と歴史

密 = 宀 (roof) + 必 (must, phonetic) — close, airtight; 封 = 土 (earth/soil) + 寸 (inch) — to seal, to close. Together: to close tightly, leaving no opening.

文化的背景

世代: All ages

社会的背景: Universal