Please pay attention to the subtle differences, particularly the Tangential line marking the fillet's point of contact with its adjacent surface, and how the reflections break there as well.

请注意细微的差别，尤其是切线标示出的倒圆角与临近面的连接处，还有在那里反射光是如何被打断的。

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Top: Checkpoint Charlie crossing point, in June 1968, then marking the border between East (Soviet sector) and West Berlin (American sector).

上图：1968年6月，标志东德(苏联控制区)和西德(美国控制区)分界点的查理检查站(Checkpoint Charlie)。

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This event used to be an important turning point, marking the end of the college years.

曾经，毕业宴会作为一个重要的转折点，标志着大学生涯的结束。

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Adding salt to the wound is the future employment index fell further, by 17 points, marking a 32 point decline in the last two months.

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Barnardo's report comes amid a series of government pledges marking the midway point of the coalition - including a promise to help with the expense of childcare.

BBC: mum and daughter

Earlier, Mr Le Drian said the jihadists had now scattered, marking a "turning-point" in France's intervention.

BBC: France's Francois Hollande to visit Mali