2.Food which has been closed up in tins is called tinned food.
密封罐头里的食品叫作罐装食品。
3.He closed up when he found he knew practically nothing about the subject under discussion.
当他发现自己对所讨论的问题实际上无所知时, 就不再开口了。
4.Close up, the workmanship that went into each ripple and shadowy layer of tulle was inimitably precious, yet somehow the designers successfully dodged the hazard of veering into overdone froufrou.