Twoheyn.图伊twonum.二；两个two-axes track双轴跟踪two-pi counter2π计数管two-layer FCCL二层柔性覆铜板two tune systems两大声腔体系two clear fronts两个明确的阵线two layer fluids两层流two fluid system双工质系统,双流体系统two-way change双项变化two-winged fly双翅蚊蝇twopiece housing两段式桥壳

1. The crystals are bistable, which means that they can remain in either a reflective or non-reflective state without any power.
   这种液晶是双稳态的，意即没电时能保持反射状态或非反射状态。
2. Thus, the only two magnetic fields for which we have any significant historical record are bitable.
   这样，我们己有重要历史纪录的惟一的两个磁场是双稳态的。