求翻译：生物圈二号是一个密闭的空间，它们的植物是一起进行光合作用和呼吸作用的。当地球的一半是白天，另一半是黑夜时，一部分会进行光合作用，一部分会进行呼吸作用，所以不稳定。是什么意思？

Biosphere 2 is a confined space, they are together plant photosynthesis and respiration. When half of the earth during the day, the other half is night time, will be conducted as part of photosynthesis, respiration will be conducted as part of, so unstable.

biosphere 2 is a confined space, and their plant is a carry out photosynthesis and respiration. When the earth is half of the day, while the other half will be part of a dark night, when a part will carry out photosynthesis, carry out respiration, so it is not stable.

Biosphere two are an airtight space, their plant is carries on the photosynthesis and the respiration together.When the Earth one half is the daytime, when another one half is the dark night, a part can carry on the photosynthesis, a part can carry on the respiration, therefore is unstable.

The biosphere is a confined space, second, they are plants for photosynthesis and respiration. When the Earth is one half of the day, the other half is a night-time, part of photosynthesis, part of respiration, so unstable.

Biosphere 2 is a confined space, they are together plant photosynthesis and respiration. When half of the earth during the day, the other half is night time, will be conducted as part of photosynthesis, respiration will be conducted as part of, so unstable.