内容：
在英语中，描述“发胖”这一现象的动词有很多，以下是一些常见的动词及其用法：
1. Gain Weight
“Gain weight”是描述发胖的最直接、最常用的动词短语。它意味着体重增加，通常用于描述由于饮食过量或缺乏运动而导致的体重增加。
例如：
She has gained a lot of weight since she started eating out more frequently.
His weight gain was attributed to his sedentary lifestyle and poor diet.
2. Put on Weight
“Put on weight”与“gain weight”类似，也是描述体重增加的常用短语。它通常强调体重增加的过程，而不是增加的具体数值。
例如：
I have been trying to put on weight, but it's been a slow process.
He put on weight after he stopped smoking, which was unexpected.
3. Gain Pounds
“Gain pounds”是另一种描述体重增加的常用动词短语，它直接指出了体重增加的具体单位——磅。
例如：
She gained pounds quickly after the birth of her child.
He has gained pounds since he started his new job, which requires a lot of desk work.
4. Pack on Pounds
“Pack on pounds”是一个较为口语化的表达，用来描述体重迅速增加的情况。
例如：
She packed on pounds after she started eating fast food for lunch.
He packed on pounds over the winter break due to lack of exercise.
5. Become Overweight
虽然“become overweight”是一个动词短语，但它更多地用来描述一个人的体重状况，而不是描述体重增加的过程。
例如：
It's important to be aware of the risks of becoming overweight.
She became overweight after she quit her job and gained more free time to eat and watch TV.
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