一个只有两层的简单数据库方案不太可能达到上述性能需求。
A simple two tier database-only approach is not likely to achieve the performance requirements outlined above.
像伦敦郊区的大部份地方，它包括只有两层，地下及一楼。
Like most of London's suburban houses, it consists of only two floors, the ground floor and the first floor.
珠心细胞只有两层，细胞核大，胞质丰富，内含贮藏物质，至心形胚期逐渐解体。
There were only two layers of nucellus which had abundant cytoplasm and reserved substance, and were consumed at the stage of late heart-shaped embryo.
这种想法很有吸引力——每个报告只有一层编码，而不是两层或者更多层。
This idea was attractive — only one layer of coding for each report, rather than two or more.
简单的钢网格从结构上支持这个两层空间，只有浴室和阁楼卧室从主要生活空间遮蔽掉。
The simple steel grid structurally supports the two level space, where only the bathroom and bed loft is shielded from the main living space.
大多数被子植物的胚珠有两层珠被，而裸子植物通常只有一层。
Most angiosperm ovules possess two integuments, while gymnosperms usually have only one.
许多房屋是正方形的和一些则是圆形的，一些房子只有一层，而另外一些房子则已经两层或更多。
Many houses are square and a few are round. Some houses have only one floor, and others have two or more.
学校的地图，只有一丁点大的教学楼，一共就两层还安电梯，不要太享受哦。
This is the map of IHK, our teaching building not so big. Just 2 floors building, but still have many elevators, too convenient.
学校的地图，只有一丁点大的教学楼，一共就两层还安电梯，不要太享受哦。
This is the map of IHK, our teaching building not so big. Just 2 floors building, but still have many elevators, too convenient.
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