The horse had a white mark on its head.

这匹马头上有块白斑。

《牛津词典》

Mark Simmonds, international head of science at the Whale and Dolphin Conservation Society, said the prospect of using dolphins to study diabetes was "a grave concern".

“鲸与海豚保护协会”科学部国际负责人马克·西蒙德认为，期望通过海豚来研究糖尿病非常令人担忧。

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And it's that unnoticeable man with a big birth-mark on his head who will be blamed for it.

就是那个头上戴着出生标记的不引人注意的人因此而受到责备。

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The twist: she also spent time assisting former Enron investor relations head Mark Koenig .

FORBES: Lay, Skilling Defense Team Goes On Offense

Mark Osikoya is head of Olympic Sponsorship Assets (London 2012) for the Atlanta-based firm.

BBC: Business

"It's definitely much more competitive now, " says Mark Devoy, head men's coach at Cornell.

WSJ: How Squash Got Serious