signan.正负号函数signn.手势；招牌；符号；迹象；正负号v.签；签名；做手势；做标记signed constant带符号常数,有符号常数Sign earthquake标志地震sign production符号生产significationaladj.正确意义的sign one's name签名sign-on agent登录代理signsl analysis信号分析sign-languagen.手语sign Beccaris's绵羊成品饲料signed distance符号距离