彼得听着，心忽上忽下。
中国企业的产品质量忽上忽下，国人难以建立信心，严重影响了品牌的塑造。
With product quality being wildly inconsistent, Chinese enterprises can hardly build brands in which people have faith, thus creating obstacles to the establishment of China's international brands.
在我被正确诊断为双相情感障碍前的四年，我的生活象一个忽上忽下的旋转木马。
My life was an up and down merry-go-round for about four years until I was correctly diagnosed with bipolar disorder.
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