The researchers also filtered the sharks feces from the water using a fine mesh, allowing them to test how much of what went in came out.
请问老师，有人说这个allowing是目前分词做目的状语，对么？
目的状语的逻辑主语不就是主语吗？那样研究职员自己让自己显然不太合理。
我感觉应该是feces的非限定性定语，对么？可是如此一来这句子的成分就有的间隔太远容易歧义了吧？
PS：我感觉不是做mesh的非限定性定语是什么原因主如果由于逻辑没feces更贴合。那样假如mesh这个地方的名词恰好也可以和后句的分词形成符合逻辑的动作的时候，又该怎么样理解语法呢？是否那时候的目前分词作哪个的定语就完全看逻辑而没法看语法了呢？
allowing的逻辑主语为前面整个句子，这种状语有哪些用途是对句子作补充说明。假如有明显的结果意义，则可剖析为结果状语（句子状语）。这个分词作状语可以改为which引导的关系分句，which的先行词为主句内容。
The researchers also filtered the sharks feces from the water using a fine mesh,which allowedthem to test how much of what went in came out.
或者改为并列句：
The researchers also filtered the sharks feces from the water using a fine mesh, and this allowed them to test how much of what went in came out. (this 指代主句内容）
