注入

1. Origins, structure, and basic meaning

• Structure: It is read ちゅうにゅう. 注 contributes pouring and 入 entering, forming a word for putting liquid or similar material into something.
• Basic usage: It is used when a material is introduced into a receptacle, such as resin into a mold.
  • 型の中に樹脂をゆっくり注入し、気泡が残らないようにした。

2. Common pitfalls and similar expressions

• Figuratively infusing energy
  • 活力を注入する means infusing an organization or group with fresh energy. The example about newcomers describes a stagnant team becoming energized.