While you might choose to have separate packages for grouping related classes in a real-world plug-in, in this case, there will be only two classes, so there's no need.

尽管在实际的插件中，您可以选择用不同的包对相关的类进行分组，但在本例中，只有两个类，所以不必这样做。

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This helps manage complexity, establishes required name spaces, facilitates reuse, and keeps separate concerns in different packages (see Figure 7).

这有助于管理复杂性，创建需要的名字区域，促进重复利用，并对不太的包保持不太的关注程度（见于 图 7）。

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This helps manage complexity, establishes required name Spaces, facilitates reuse, and keeps separate concerns in different packages (see Figure 7).

这将有助于管理复杂性、建立需求名字空间、使复用变得容易、并且保持不同包之间的独立性，请参见图7。

youdao

The Ballot Act of 1872 states that "the presiding officer of each station, as soon as is practicable after the close of poll, shall, in the presence of the agents of the candidates, make up (the ballot boxes) into separate packages sealed with his own seal and the seals of such agents of the candidates as desire to affix their seals".

BBC: BNP to put own seals on ballot boxes over fraud fears

The tubes are stacked along the sides of the large conveyor-style robot that packages them into separate plastic pouches.

FORBES: Drug Lord

About 6 in 10 of all voters and independents agree with each of these proposals: cracking down on pay packages that encourage excessive risks, a Consumer Financial Protection Agency separate from the Federal Reserve and a new tax on the largest financial institutions to recoup any bailout losses.

FORBES