1、MathML2 had no explicit support to control the directionality of layout.
MathML2對(duì)于控制布局的方向沒(méi)有顯式的支持。

2、There is no operative"voltage dead zone", and the definite directionality exists.
同時(shí)，繼電器不存在動(dòng)作的“電壓死區(qū)”，具有明確的方向性。

3、The directionality and the range of correlation for the water levels were revealed.
揭示了該地區(qū)水位的空間結(jié)構(gòu)性—方向性和相關(guān)距離。