妨碍
... flexibility n. 弹性;适应性;灵活性 hindrance n. 障碍;妨碍;妨害;阻碍物 approximate vt. 使…接近;近似;粗略估计 vi. 接近于;近似于 adj. 大概的;近似的 ...
障碍
的障碍∕绊脚石 hindrance n. 障碍(物),妨碍 b.
障碍物
... hexagonal六角形的,六角的 hindrance障碍,障碍物 hob滚刀,冲头 ...
障隔
... 同本义〖dangerousplace〗 妨碍物;障隔〖hindrance;resistance〗 地形崎岖多阻隔,道路难行〖(ofroad)dangerousanddifficult;notlevel〗 ...
Steric effects arise from the fact that each atom within a molecule occupies a certain amount of space. If atoms are brought too close together, there is an associated cost in energy due to overlapping electron clouds (Pauli or Born repulsion), and this may affect the molecule's preferred shape (conformation) and reactivity.