They can't repairdamage that has already been done - but can save sight by stopping any further deterioration.
尽管眼药水不能弥补疾病对眼睛已经造成的损伤，但是却可以防止视力进一步恶化，从而保护视力。
2
They also spent less time in each of these stages, so interfering with the body’s ability to repairdamage suffered during the day.
人们在各个阶段的时间也会减少，这干扰了恢复体力的能力，白天就会更加困乏。
3
Scientists are trying to identify these cardiac stem cells, and then figure out how to juice them up so they can repairdamage caused by a heart attack.