Well, it is the stuff that lives in a small box whose base is that piece of surface and whose other side is given by the vector field.
单位时间内的流量就是一个小立体，它的底是曲面上的一块，它的高由向量场给出。
Plus, they host sleepovers called "Slumber Parties in a Box" where girls are given free stuff, and of course, there's more talk of products.
此外，她们在别人家过夜，这被称为“在盒中睡觉“，在这里女孩们会得到免费的东西，当然，还有更多关于产品的交谈。
It's common etiquette to bring some gifts if someone invites you over for dinner, you know like, a box of chocolate, a bottle of wine or stuff like that.
比如受邀到别人家里赴宴，给别人带一盒巧克力或一瓶酒这样的礼物是一般礼节。
It's common etiquette to bring some gifts if someone invites you over for dinner, you know like, a box of chocolate, a bottle of wine or stuff like that.
比如受邀到别人家里赴宴，给别人带一盒巧克力或一瓶酒这样的礼物是一般礼节。
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