She sat twirling the stem of the glass in her fingers.
她坐在那里用手指捻著玻璃杯的杯颈.
A slight curving or circular movement in a stem, as of a twining plant, caused by irregular growth rates of different parts.
转头运动植物茎的轻微弯曲或扭转的生长，象双生树那样，由不同部分的不规则生长速度引起
She bought some roses with long stems.
她买了一些枝干很长的玫瑰花。
