They give you a firm foundation upon which you can add more OO habits and build software that is easily maintained and extended.

它们将为您提供更牢固的基础，在此基础之上建立更多OO习惯并构建可轻松维护与扩展的软件。

youdao

Interest rates were kept at their current target range of 0-0.25 per cent, and the Fed maintained its pledge to hold them there for an "extended period".

美联储将利率保持在目前0 - 0.25%的目标区间，并承诺“在较长时期内”保持利率不变。

youdao

Yet even if the power of Mr Saleh's state has seldom extended beyond Yemen's main towns, roads and oilfields, it is remarkable that he has maintained even a semblance of control (see book review).

ECONOMIST: Yemen