Newlywed couples take a ride on Line 1 to experience a "subway wedding" in Shenyang, Liaoning province on Sept 27, 2010.
2010年9月27日，来自辽宁沈阳的多对新人搭乘地铁一号线体验了一把“地铁婚礼”。
Suppose you are in a long line at checkout counter 1 — you can roughly guess how long it would take to move up in that line.
假设您排在1号付款台前的长队中，您可以粗略地估算出大概需要多久时间才能排到自己付款。
If you find that the line moves slowly and see that another cashier is coming to checkout counter 4 to open it for business, you would quickly take your cart to that counter (see Figure 1).
如果您发现这条队伍移动缓慢，而且此时看到一名收银员走向4号付款台打开机器准备工作，那您一定会推着购物车快速地跑到4号付款台(请参见图1)。
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