※ 질문하기질문내용This moves by gliding along on its muscular base. This motion is powered by succeeding muscularwaves which move across the undersurface of its body.

이거 해석이 왜 이렇게 애매하게 느껴질까요ㅠ
gliding along on its ~부분하고 which move across~
이부분이 왜 이렇게 이상한거 같은지.. 그 해설이라고 뜬 그 문장들 말이죠ㅠㅠ그리고 and the police came to his aid.가 그냥 경찰이 그를 도와주러 왔다이던데요
his aid가 어떻게 쓰인거길래 저렇게 해석이 되죠???
How do you say thanks when someone lends you a helping hand? One person did it with a million dollars. The person was visiting Peoria, Arizona. He suddenly became ill, and the police came to his aid. When the stranger died years later, he (A) left / has left the Peoria police department a million dollars. The money was to be used to (B) help / helping others who needed emergency care. Who was the rich person? The person asked that his name bekept secret. We’ll never know because the police can’t tell. Let’s just say it was someone (C) who / whom knew how to say thanks.

그리고 stored in its memory are pictures that show what happens to faces over time
여기에선 stored ~memory are 여기까지가 해석을 잘 못하겠어요..ㅠ 갑자기 왜 문장앞에 과거인지 과거분사인지가 나오는걸까요...

도와주세요~~
“What will I look like 25 years from now?” This is a question Nancy Burson used to ask herself. So she and some computer experts invented the Age Machine. The Age Machine is part TV camera, part TV set, and part computer. ① The camera takes a picture of a person’s face, then the computer goes to work. ② Stored in its memory are pictures that show what happens to faces over time. ③ It is often believed that the different parts of a person’s face show his personality. ④ When the computer finishes its job, the TV set shows what the person’s face will look like in the future. ⑤ It can also show what the face looked like in the past. The Age Machine can go forward or backward.