But Virgin's network is limited and fibre-optic cables are expensive.
但是维京网络毕竟有限，而光纤电缆价格昂贵。
A new submarine fibre-optic cable is now being laid down the west African coast.
西飞海岸外正在铺设海底光缆，世界银行提供了三千万美金支持这个项目。
Tumors in deep part that optic fibre cannot reach to.
光导纤维不能到达的深部肿瘤。
Tumors in deep part that optic fibre cannot reach to.
光导纤维不能到达的深部肿瘤。
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