n.

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

   除去苹果的核。

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

   让我们看看事情的核心。

3. 中心部分[the S][（+of）]
4. 【美】（共修的）基础课设置
   Each student studies four core subjects.

   每个学生学习四门基础课。

5. 岩芯；（铸造用的）砂芯；（树的）芯材

vt.

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

   请替我把这些苹果洗净并除去核。

2. 取……的岩芯样品
3. 用砂芯铸

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.