In the process of water resistant test for locomotive, normally the load current is hard to adjust because of the unceasing change of water temperature.
在机车水电阻试验过程中，存在水温不断变化而造成负载电流调节困难的问题。
As a programmer, much of your challenge is to cope with unceasing change: new protocols, application programming interfaces (APIs), customer requirements, hardware constraints, and so on.
作为程序员，很多挑战是要应付不断的更改：新的协议、应用程序编程接口(API)、客户需求、硬件约束等。
This kind of boundary is relative, only has the temporary stability and the validity, it along with situation change, but unceasing vicissitude.
这种边界是相对的，仅具有暂时的稳定性和有效性，它随着情境的变化而不断变迁。
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