The state of being poor, be lack of necessaries of life.

贫穷困苦，缺乏生活必需品。

The inside reason that"swim bladder bulge"disease took place may be lack of DHA and EPA and higher AA.

导致稚鱼阶段“胀鳔病”发生的内在原因可能是DHA和EPA的缺乏以及AA偏高。