hand-signalsCOCA²³⁷⁵⁰² 基本例句 un.手势信号；🌏手示信号；潜水手势；手信号 Tokai University professor Tsukasa Murayama started training Nack after he became dissatisfied with hand-signals currently used to communicate with dolphins and whales. 东海大学的村上司教授对于用手势与海豚和鲸鱼交流并不满足，于是他开始教纳克“说话”。 www.chinadaily.com.cn