感觉上我们好像已从天底走到了天顶.It felt as if we had traveled from nadir to zenith.天底天球上,在观测者垂直向下的一点, 与天顶完全相对.A point on the celestial sphere directly below the observer, diametrically opposite the zenith....
单靠操纵方向舵转弯是困难的.It is difficult to execute turns with rudder control alone.方向舵资料通常包括两条曲线.Usually the rudder information is grouped into two curves.方向舵帮助转弯.The rudder aids in turning....