1. that will not have any appreciable or noticeable impact on the air traffic control infrastructure in the foreseeable future today. now, 20 years down the road, who knows?

요거 해석좀 부탁드려용~

2. 글구 마지막 부분에 them이 뭘 뜻하는걸까요?
난 내 자전거를 타고 쉽게 내려갈 수 있다...인데 them을 어떻게 처리해야 할까요?
the car that usually made the deliveries was too big to go down those streets, but i could easily ride my bicycle down them.