動(dòng)詞 build-in:

1. make something an integral part of something else
   同義詞：build in

形容詞 built-in:

1. existing as an essential constituent or characteristic
   同義詞：constitutional, inbuilt, inherent, integral

built-in

adj.（形容詞）
Constructed as part of a larger unit; not detachable:
嵌入的：作為一個(gè)大整體的一部分建造的；不可分的：
例句：
a built-in cabinet.
嵌入的櫥柜

Forming a permanent or essential element or quality:
永久性，必要的：作為或永久的必需的因素或品質(zhì)的：
例句：
a built-in escape clause.
必要性的免責(zé)條款

【引伸】
built.-in.
n.（名詞）