mindmap root((松弛)) loose is widely referable to persons or things free from a usual or former restraint: a book with a ~ page; or to something not firmly or tightly held or connected between points of contact: drive with ~ reigns; or to a substances or fabric with particles or filaments in open arrangement: a ~- woven woolen. （substance泛指物质东西如固体粉末液体气体等，具有属性a substance is a solid, powder, liquid, or gas with particular properties，如sound travels with different velocities through different substances声音在不同的物质中传播速度不同） （fabric两个意思，1布料织布cloth or other material produced by weaving cotton, silk, nylon，如cotton/furnishing fabric棉/装饰布料, 如whatever your colour scheme, there's a fabric to match无论你用什么色彩图案，都有与之相配的布料；2 建筑或社会的基本结构basic structure of a building such as walls, roofs, and materials or the basic structure of society such as beliefs and customs,如this trend threatens the very fabric of our society这种趋势威胁着我们社会的基本结构，如the extreme climate caused the fabric of the building to rot away极端气候使建筑结构发生腐蚀） relaxed implies a loss of some tightness, tension, strictness, or rigidity; it may also imply an easing of rather than a freeing from what restrains: the ~ discipline of the last few days of school. slack otherwise close to relaxed, may stress lack of firmness and steadiness: an overweight body, pudgy and ~. lax stresses lack of steadiness, firmness, and tone or, in respect to immaterial things, may stress lack of needed or proper steadiness and firmness: a ~ administration.