two-tone
/ˈtuːtəʊ/adjective
1- having two different shades or colours两种色调的; 两种颜色的：
a two-tone jacket.
双色茄克衫。
1.1
- emitting or consisting of two different sounds, typically alternately and at intervals（尤指交替或间歇地）发双音的; 双音构成的：
a two-tone pulse signal.
双音脉冲信号。