尽管如此，公司在管理并维持污水收集和处理项目方面的能力仍有所提升。
Nevertheless, it developed capacity in managing and maintaining septage collection and treatment projects.
使用弱引用后，可以维持对referent的引用，而不会阻止它被垃圾收集。
With weak references, you can maintain a reference to the referent without preventing it from being garbage collected.
这些电子被引入一个球形金属收集器以产生电流，继而产生线圈的磁场——这样这个系统就可以自我维持了。
These electrons get funnelled into a metal spherical receiver to produce a current, which generates the wire's magnetic field - making the system self-sustaining.
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