altruistic behavior短语¹⁴⁴⁹⁷²⁺² 基本例句 利他行为 And preschool-age children are easy to preform altruistic behavior to their teachers. 学前儿童对不同对象的利他选择存在差异，幼儿更易于对教师作出利他选择。 blog.sina.com.cn Joan Silk, an anthropologist at the University of California, Los Angeles, says that there is“no doubt” that chimps engage in altruistic behavior in the wild. 加州大学洛杉矶分校的人类学家琼·希尔可说，黑猩猩在野生条件下表现出利他主义是“毫无疑问”的。 yeeyan