tenuous

1. (联系)脆弱的;(理由)站不住脚的，牵强的;(地位)不稳固的
If you describe something such as a connection, a reason, or someone's position as tenuous, you mean that it is very uncertain or weak.

e.g. The cultural and historical links between the many provinces were seen to be very tenuous...
许多省份之间的文化和历史纽带被认为是很脆弱的。
e.g. This decision puts the President in a somewhat tenuous position.
这个决定使得总统的位置有些岌岌可危。

1. 纤弱的：肺动脉下VSD型DOLV是第二常见的类型(圆锥隔缺损型,the conal septal defect type),圆锥隔发育极度不良(tends to be very dificient),可能存在纤弱的(tenuous)肺动脉-二尖瓣纤维连续,并且肺动脉以不同程度跨越在室间隔上.

2. 稀薄的：penury 贫困, 贫穷 | tenuous 稀薄的 | ecstasy 入迷

3. 纤细的：tenuity 薄 | tenuous 纤细的 | tenure 保有条件