要分辨一种物质，可以用密度测量法。而无须借助费事繁琐的化学分析法。
One way to identify a substance without resorting to fiddly chemical methods is to determine its density.
您现在可以与基于HTTP的系统集成，而无须编写自定义代码。
You can now integrate with HTTP based systems without needing to write custom code.
接口机制的优点是可以将契约快速集中在一起而无须实现任何方法。
The advantage of the interface mechanism is that you can put together a contract quickly without implementing any of the methods.
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