在最前沿的零售商店里，比如多佛街的维多利亚·贝克汉姆，当你想付款时，你不用站在任何收银机前。
At the most cutting-edge retail stores—Victoria Beckham on Dover Street, for instance—you don't go and stand at any kind of cash register when you decide to pay.
这个建议很有用，因为展开剂前沿的溶剂常在被标记前己挥发掉。
This is useful because the solvent will often evaporate before the final solvent front can be marked.
目前的研究前沿主要集中在叠前深度域和弹性波。
The leading research foreland mainly focuses on pre-stack depth domain and elastic wave.
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