main messenger
主要的信使
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Ideally Facebook hoped, they would use Messenger instead of the main SMS on their phones.
FORBES: Facebook Messenger Takes On SMS, With No Account Needed
The Messenger app was a separate app from the main Facebook app but allowed a focus just on messages, for people who send messages on their phones constantly.
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