n.

1. 果核，果心
   Cut out the core of the apple.

   除去蘋果的核。

2. 核心，精髓，要義[the S][（+of）]
   Let's get to the core of the matter.

   讓我們看看事情的核心。

3. 中心部分[the S][（+of）]
4. 【美】（共修的）基礎課設置
   Each student studies four core subjects.

   每個學生學習四門基礎課。

5. 岩芯；（鑄造用的）砂芯；（樹的）芯材

vt.

1. 挖去……的果核
   Wash and core these apples for me, please.

   請替我把這些蘋果洗淨並除去核。

2. 取……的岩芯樣品
3. 用砂芯鑄

n.

1. the tough central part of various fruits, containing the seeds.
2. the central or most important part.
   ▸the dense metallic or rocky central region of a planet.
   ▸the central part of a nuclear reactor, which contains the fissile material.
   ▸a piece of soft iron forming the centre of an electromagnet or an induction coil.
3. an internal mould filling a space to be left hollow in a casting.
4. Archaeology  a piece of flint from which flakes or blades have been removed.
5. a cylindrical sample of rock, ice, or other material obtained by boring with a hollow drill.

v.