crowded conditions

基本解释

Sullivan also pointed to possible "complicating factors, " such as malnutrition, poor housing or crowded conditions.
Sullivan也指出可能有复杂的因素比如营养不良或居住条件恶劣社会环境拥挤。
Poultry flocks are worst affected, transmitting the virus easily in crowded conditions; however, the infection of wild birds is also an increasing concern.
家禽最容易感染该病，因为拥挤的环境使传播该病毒变得容易。但野鸟感染病例变得越来越多。
The clothing analogy might not be too far off, since the human population boom, combined with ever more crowded conditions, is likely increasing evolutionary pressure on our own individuality.
服装的比喻可能离现实不远了，因为人类人口的爆发式增长，加上更加拥挤的环境，很可能会对我们自身的个体性产生进化方面的压力。

The long-term safety of Chinese fish is uncertain, according to William Hubbard of the lobbying group Coalition for a Stronger FDA. He said many Chinese fish are raised in polluted waters and over-crowded conditions.
NPR: Chinese Seafood on List of Questionable Products