line_quality: “clean, crisp”
（二）引航员或者除船员外为船舶提供服务的其他任何人；
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Many systems and monoliths that have been built a long time ago were also modular, but their modules were mostly based on the classical Three-tier Architecture. Such a setup has a low testability, because the Business layer required the Data Access Layer (DAL) to operate even in unit tests (or you had to do a code surgery to find seams, if there were ones).
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