crowded conditions

基本解释

Sullivan also pointed to possible "complicating factors, " such as malnutrition, poor housing or crowded conditions.
Sullivan也指出可能有複襍的因素比如營養不良或居住條件惡劣社會環境擁擠。
Poultry flocks are worst affected, transmitting the virus easily in crowded conditions; however, the infection of wild birds is also an increasing concern.
家禽最容易感染該病，因爲擁擠的環境使傳播該病毒變得容易。但野鳥感染病例變得越來越多。
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.
服裝的比喻可能離現實不遠了，因爲人類人口的爆發式增長，加上更加擁擠的環境，很可能會對我們自身的個躰性産生進化方麪的壓力。

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