"fat"的原形是 fat。它可以用作名词、动词和形容词，主要意思包括“脂肪”、“肥肉”、“肥胖”等。在计算机领域，"fat"还可以指文件分配表（File Allocation Table，简称FAT），这是一种由微软发明的文件系统，用于管理磁盘上的文件。

1. She's gaining weight； she needs to watch her fat intake.

2. The fat on his waist is really noticeable.

3. The fat in the fryer had heated all right.

4. The file allocation table （FAT） is a crucial part of early computer systems.