1·The FAA then recognised two types of operating environments.
联邦航空局随后识别出了两种操作环境。
2·They do not ruin environments or use enormous amounts of energy.
它们不会破坏环境或消耗大量能源。
3·Salt marshes are among the least inviting environments for plants.
盐沼是最不适宜植物生长的环境之一。
4·Informal learning environments tolerate failure better than schools.
非正式的学习环境比学校更能容忍失败。
5·Nevertheless, mature natural environments are usually in equilibrium.
然而，成熟的自然环境通常处于平衡状态。