同义词
1)haptotropism,向触性2)thigmotropism,向触性3)omnidirectional contact,万向触发4)double throw contact,双向触点5)two way contact,双向触点6)two-way contact,双向触点7)T flip-flop (=toggle flip-flop),双向触发器8)trigger-pulse steering,导向触发脉冲9)firing gear,转向触动齿轮10)break-make contact,断-合触点，换向触点
