American r's usually are made for most people with the sides of the tongue kind of bunching up.

大多数人发美式口音中的“r”音时，他们舌头侧方会有点揉成一团的感觉。

Just one of many measures meant to keep kids from bunching up and preventing the spread of the coronavirus, the head of Secondary Education says.

中等教育部门的负责人说，这只是许多旨在防止儿童聚集和防止冠状病毒传播的措施之一。

Since you don't have any implement, you might try bunching up your fabric in the back of you, and creating a kind of ledge, and then hooking yourself there, and totally relaxing.

如果你没有什么工具，你可以试着把你衣服的折叠一下，做一个垫子，然后向后靠，并且放松。

One possibility is that this glass-like structure physically prevents all the other proteins and junk in a cell from bunching up or unfolding, and it keeps any membranes from fusing together.

一种可能性是，这种玻璃状结构在物理上阻止了细胞中所有其他蛋白质和垃圾聚集或展开，并防止任何膜融合在一起。