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。
And, if that were to fail, then he'd stuff himself into a box and drift until he reached a foreign shore or died trying.
如果要是失败了，他就钻进什么箱子里漂流到外国的海岸，或者，死掉拉到。
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。
应用推荐