In others, such as Britain, the brain's stem is regarded as the crucial part. In this case simpler tests can be applied, such as whether a patient's pupils react to light.
The long stem of bamboo is hollow, which makes them light and strong.
竹子长长的茎是空的，这使它很轻很结实。
3
Stem cell research is considered promising, although far from producing results, and other studies involve a light-responding protein and retinal transplants.