这个问题可以使用多焦点人工晶体来解决，它拥有一些同心圆环，该圆环上的物质能提供交替调节近距离和远距离视力的区带。
That can be addressed with multifocal lenses, which have concentric rings of material that offer alternate bands of near and distant vision.
城市的更新，就物质方面来看，在于各种城市建筑及设施的新旧交替。
Updating of the city, on the material point of view, lies in a variety of urban architecture and facilities of the inter-face.
气体、表面活性剂与聚合物三种物质完全分开交替分段塞注入时压力升幅最小，耗时最长，采收率最小。
The medium pressure and EOR result from the alternate injection of gas and liquid. The consuming time of simultaneous injection is the shorter than that of alternate of gas and the liquid.
气体、表面活性剂与聚合物三种物质完全分开交替分段塞注入时压力升幅最小，耗时最长，采收率最小。
The medium pressure and EOR result from the alternate injection of gas and liquid. The consuming time of simultaneous injection is the shorter than that of alternate of gas and the liquid.
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