4月10日，一张遥远银河上黑洞的照片成为科学史上的一座里程碑。
A landmark in the history of science was made by a photo which was taken on April 10th about the black hole in a faraway galaxy.
无论如何，伊朗在核征程上又刚跨过了一座里程碑。
Nonetheless, Iran has just passed another nuclear milestone.
但是，泰晤士河隧道是隧道工程历史上的一座里程碑。
But the Thames tunnel is ahistorical milestone in tunnel engineering.
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