adj.兼性（的），任意的，可选择的，授权的；特许的

Some plants are facultative annuals, meaning they can live for multiple years or just one, depending on environmental conditions.
这些植物是可选的一年生植物，也就是说它们能存活多年或仅一年，这取决于环境条件。
The use of a particular language is facultative among speakers of multilingual communities.
在多语种社区中，使用某种特定语言是可选择的。
A facultative eukaryote is an organism that can switch between being a prokaryote and a eukaryote under certain circumstances.
可选择的真核生物是指在特定条件下可以从原核生物转变成真核生物的生物。
In psychology, some behaviors can be considered facultative, meaning they may not occur in every individual.
心理学中，有些行为被认为是可选的，即不是每个人都会表现出这些行为。
The course on philosophy is facultative, so students can choose to enroll if they have the interest.
哲学课程是选修课，学生如果有兴趣可以报名参加。
The animal's ability to hibernate is facultative, meaning it depends on factors like food availability and climate.
动物冬眠的能力是可选择的，取决于食物供应和气候条件。
The university offers a wide range of electives, including facultative courses in music and art history.
这所大学提供了众多选修课，包括音乐和艺术史等可选课程。
The software allows users to turn on or off certain features, making it facultative in functionality.
这款软件允许用户开启或关闭某些功能，使其功能具有可选择性。
A facultative alga is a type of plant that can live in both freshwater and marine environments, depending on availability.
可选的藻类是一种能在淡水和海洋环境中生存的植物，这取决于环境条件。
The company offers flexible working hours as a benefit, which is facultative based on employee preference.
公司提供弹性工作时间作为福利，这根据员工的喜好是可选择的。