tenuous
adj
1 thin; slender 薄的; 细的: the tenuous threads of a spider´s web 蜘蛛网的细丝.
2 having little substance or significance; very slight 空洞无物的; 无关紧要的; 细微的
tenuous distinctions 细微的区别
preserve tenuous links with one´s former friends 与过去的朋友维持不即不离的联系
The difference, if it exists, is extremely tenuous. 这种差别即使存在也是微不足道的.