采用这个标准的应用程序需要一个模块加载器来按需加载模块，并解析模块间的依赖关系。
An application that adheres to this standard requires a module loader to load modules on request, and resolve inter-module dependencies.
内核模块加载器也在2.5中完全被重新实现，这意味着模块编译机制相对于2.4有了很大不同。
The kernel module loader has also been completely reimplemented in 2.5, which means that the module-building mechanism is much different compared to 2.4.
Angular不附带模块加载器，也不偏爱任何第三方库(虽然大多数例子使用SystemJS)。
Angular does not ship with a module loader and does not have a preference for any particular 3rd party library (although most examples use SystemJS).
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