ally arm

基本解释

The banking arm of GMAC changed its name to Ally Bank last week in an effort to repair its tarnished image and attract customers.
GMAC资助的银行在上个星期改名为联合银行，目的是为了重整其已败坏形象，以吸引顾客。
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And the ROK is well able to defend itself, in contrast to 1950, when Washington had refused to arm its ally after Seoul threatened to invade the north.
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