PHRASAL VERB 允许（空气、光线、水等）进入 If an object lets in something such as air, light, or water, it allows air, light, or water to get into it, for example because the object has a hole in it. 允许（空气、光线、水等）进入 [Also VERB n PREPOSITION]
...balconies shaded with latticework which lets in air but not light.