Suddenly, without obvious cause, her heart sank, and she asked herself frantically how she could possibly get through her confinement.
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without obvious cause
没有明显原因
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Simple Obesity refers to a class of Obesity without any obvious cause, it is only characterized by Obesity. Simple Obeisty makes up more than 95% of Obesity.
单纯性肥胖是指无明显病因可寻，而只有肥胖表现的一类肥胖症，占肥胖人数的95%以上。
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