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1·For years, Jackson seems to have swallowed a variety of pills ad libitum.

多年以来，杰克逊看起来已经随意吞咽了许多种药片。

2·Proteins and low-GI foods ad libitum -- the way ahead

蛋白质和不限量低 GI 食物—曙光在前

3·Abstract : This experiment was conducted to investigate the effects of hot and humid environment on feeding behavior in growing-finishing pigs with ad libitum feeding.

摘要 ：本试验旨在研究湿热环境对自由采食情况下生长育肥猪采食行为的影响。