“常杰”是个多义词，它可以指常杰（山东穆斯林学者）, 常杰（华南理工大学教授）, 常杰（浙江大学教授）。
过去常被钉在教室墙上而且常出现在地图册中的那幅地图以墨卡托投影著称，最早是由弗兰德地理学家杰拉杜斯·麦卡托提出来的，可追溯至1569年。
The map you're used to seeing pinned on classroom walls and in Atlases is known as a Mercator projection, and was first presented by the Flemish geographer Gerardus Mercator back in 1569.
班杰明、尔康常为紫薇和小燕子当信差，和柳青柳红成为朋友。
Benjamin, Erkang often crape myrtle and swallow when the messenger, and red liu Qingliu become friends.
常发生在有潜在疾患的病人，因为这些病妨碍了他们对感染的正常反应，例如慢性白血病、何杰金病、囊性纤维化，以及激素治疗的病人都常发生。
It occurs in patients with underlying disease which prevents normal response to infection, e. g. chronic leukaemia. Hodgkln's disease, cystic fibrosis, and patients on steroid therapy.
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