Guinea pig They're looking for volunteers to act as guinea pigs for a new AIDs vaccine.I do not want to be a guinea pig when they test the first hyperloop train.Joanna opted to be a guinea pig for a new hair shampoo.Definition: When someone is used as a guinea pig to test new ideas or products.Etymology: How science experiments used to use guinea pigs.***试验品 实验对象 尝试 Children from poor families are guinea pigs for the company's new baby formula. 贫困家庭的孩子成为这家婴儿奶粉公司的试验品.Is it moral to ask prisoners to be guinea pigs for experiments of new medicine? 让犯人充当新药的实验对象是否道德? This is a new program and we volunteered to be the guinea pigs to test the fan base. 这是新节目,我们主动尝试调查听众数量.xxxxxxxxxxxxxxxxxxWear many hats The mayor wears many hats since he is also the police chief.People wanted Goodwin on their team for the survival challenge since he was a man of many hats. Mikeala wanted her dad to not wear so many hats so he could spend more time with her.Definition: To have more than one set of responsibilities.Etymology: Back in Victorian Britain when everyone wore hats, many of those hats were specific to a given trade, official position or function. So someone who had several roles would have several hats depending on the occasion.***身兼数职 大忙人Men love to wear many hats in order to feel important. 为了自我感觉良好,男人愿意身兼数职.She is a daughter, a wife, a mother, a professor, a social worker and a writer. She wears so many hats, I wonder how she juggles the different roles. 她是女儿,妻子,母亲,教授,社会工作者和作家,我好奇她是怎样玩转这些不同角色的.