A physiotherapeutic apparatus for preventing and treating near sighted eye has a convex lens used as objective lens, lens cone, eyepiece, headgear and lens set.
Clinicians should maintain a high index of suspicion for vaccinia when evaluating vesiculopapular rashes in patients who have been vaccinated recently and in their close contacts.
If I'm coming in very, very close to an actor, 当我离拍摄演员时,I have to get the cameras closer together than they can physically go.相机之间的离需缩小到物理上无法达到的程度。有时候甚至需到这种程度。