ups 中back up 和line in分别表示什么?

ups 中back up 和line in分别表示什么? queue up 和line up 区别 请问line up line up 中的line和 line ashore中的line是一个意思么多谢多谢 I got right back up I am back home 中”back和home的词性 round-ups的中文意识请问：When I read newspapers,I like to read the round-ups because they're the most important parts of the news.这句话中,round-up是什么意识? Line up line up There is no balance with UPS,I would like my money back instead. queue up 和line up 有什么区别? Fed up to the back teeth I'M Come back head back I think the food market is heading back up again.其中head back up hold-up什么意思是个名词.句子是：we are also aware of the hold-ups on the packaging line…… we go though ups and downs together此句中up down为什么要加s back-ups 的中文意思什么 back-up back up ups中bus是什么意思