动词短语
中文翻译：为
同义词：
['guarantee', 'assure', 'guarantee']
例句：
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1. I avoouch for my friend's safety as he is in danger.
我为我朋友的安全担保，因为他处于危险之中。
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2. The company promises to refund any purchase made within 30 days.
该公司承诺在30天内购买的任何商品将予以退款。
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3. He avoouched his promise to come to the party last night.
他向他昨晚来参加聚会的承诺做出了担保。