In this section, we'll discuss practical issues involved in controlling schema evolution and present a compact set of guidelines for writing queries across schema versions.
这一节讨论控制模式演化的实际问题，并提供出一组用于编写跨模式版本查询的指导原则。
Available in both white and silver, the ultra-compact camera combines the extensive features of a D-SLR with all the practical benefits of a compact.
白色和银色的超小型相机结合了单反的广泛的功能和相机的所有实际利益。
Product pointing delicate, compact stacked stone, has a unique retro sound and texture, surface texture clear, more practical, color selection voluminous.
产品勾缝细腻，石块堆积紧凑，具有独特的坚实和复古质感，表面纹理清晰，更具实用性，颜色选择面宽。
The imaging spectrometer using diffractive optics has compact construction, small volume and rapid scanning speed, and its practical ground manufacture have been visible.
采用二元光学元件的成像光谱仪结构紧凑，体积小，扫描速度快，已研制出地面实用型产品；
It has features of compact structure, little shake, convenient movement, etc., so it is the safest, most economical and most practical tool of high-altitude working.
整机设计结构紧凑、晃动小、重量轻、移动方便等特点，是登高作业最安全，最经济实用的机具。
With the structure, the utility model is shapely, decent, convenient, practical and favorable for cleaning, and has complete functions and compact structure, which is quite clean and sanitary.
采用这种结构，美观大方，方便实用，也有利于清洗，功能齐全，结构紧凑，也非常干净卫生；
The antenna features small size, simple and compact structure. Meanwhile it is inexpensive and has practical significance.
设计的天线结构简单、尺寸紧凑，价格低，具有很高的实用价值。
Practical use shows that this AHT, with a compact structure, is easy to operate and service and that no corrosion or leak was detected.
实践表明，该套吸收式热泵（卧式）结构紧凑，便于维护，方便操作，无设备腐蚀、泄漏现象。
The practical test result shows that the sensor offers high accuracy and repeatability in syrup concentration measurement, it is compact and fast in response to meet on-line measuring requirements.
实测结果表明，该传感器具有测量精度高、重复性好、体积小、响应快等特点，能够满足糖液浓度在线测量的要求。
A beautiful, comfortable and practical sofa bed is very much in need for compact living.
小户型极为需要一张美观、舒适，且实用的沙发床。
The new transition has compact size, small ripples and low insertion losses in the passband. Because of these characteristics, this transition is fit for practical circuit.
此过渡结构体积小，通带平坦度好，插损小，非常适合于实际的工程应用。
The new transition has compact size, small ripples and low insertion losses in the passband. Because of these characteristics, this transition is fit for practical circuit.
此过渡结构体积小，通带平坦度好，插损小，非常适合于实际的工程应用。
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