I always jokingly say it's because of two things.我常开玩笑说有两个原因

because of:因为； 由于

She could only croak because of her heavy cold.

她因患重感冒只能用沙哑的声音说话。

The war was lost because of a shortage of munitions.

战争因军火不足而失败。

词义辨析:

due to，owing to，because of，thanks to这些词组均表示“由于”之意。

due to用于较庄重的书面语中，侧重“起因于”，在句中多作表语，有时作状语。

owing to可以和due to换用，但在句中多作状语，也可作表语。

because of着重某个结果的原因，在句中通常作状语。

thanks to突出一种感激之情，含“多亏”意味。

because I've got them filled out with this fat stuff.因为我有很多脂肪填平了皱纹

fill out:填写；长胖；充实

We compel all students to fill out this form.

我们迫使所有的学生来填写这个表格。

Her face is beginning to fill out.

她的脸开始发胖。