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He believes that as far back as 30,000 B.C., hunters may have used a system of notation, engraved on bone and stone, to mark phases of the Moon.

他认为，远在公元前30,000年以前，猎人可能会用一套刻在骨头和石头上的符号系统来标记月相。

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The Achilles tendon is a strong fibrous cord that connects the muscles in the back of your calf to your heel bone.

阿基里斯腱是将小腿后部的肌群连接到跟骨的强健的纤维索。

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The most serious bunions are treated with a joint-fusion surgical procedure known as a lapidus bunionectomy, in which the first metatarsal and the next bone back, a cuneiform, are fused together.

WSJ: Young People Also Weigh Surgery to Relieve Ugly, Painful Bunions

Louis Saha has been plagued by hamstring trouble which has restricted him to 14 matches this season, while midfielder Marouane Fellaini is playing with a cracked bone in his back.

BBC: Arteta set for six-month lay-off

The most frequent procedure to correct the angular deformity is an osteotomy, or a bone cut at either the front, middle or back portion of the first metatarsal bone.

WSJ: Young People Also Weigh Surgery to Relieve Ugly, Painful Bunions