Suddenly look back, that a "big sister" where?

蓦然回首，那一句“大姐”在哪里？

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Pass by, at both ends of the road, and suddenly look back, familiar.

擦肩而过，路的两端，蓦然回首，似曾相识。

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Not everyone, when suddenly look back, the man who can see the lights dim.

不是每个人，在蓦然回首时，都可以看得到灯火阑珊处的那个人。

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Suddenly the laid back David Attenborough look is no longer appropriate.

BBC: Mark Simpson: How technology has transformed the job

By the time a stockbroker realizes that he or she is embroiled in a nasty dispute between a married couple, the damage is often done and upon looking back, the warning signs suddenly look much clearer than when they first manifested themselves.

FORBES: Husband's Unauthorized Withdrawals Land Stockbroker In Hot Water

By the time a stockbroker realizes that he or she is embroiled in a nasty dispute between a married couple (or in this case a mess involving surviving and deceased spouses and their heirs), the damage is often done and upon looking back, the warning signs suddenly look much clearer than when they first manifested themselves.

FORBES: Till Death Do Us Part Stumps Stockbroker