quadrant

n.

四分之一圆；扇形体；象限仪；四分仪

复数：quadrants

1. A symbol appears in an upper quadrant of the screen.
   一个符号出现在屏幕上端的四分圆的地方。
2. The line AB lies in the second quadrant.
   线段AB是处在第二象限中。

Quadrant sparing of the macula
Safe control of four-quadrant switches
Quadrantectomy versus lumpectomy for small size breast cancer
The Four Quadrant Phase Mask Coronagraph and its avatars
Pasteur's Quadrant: Basic science and technological innovation
Four-quadrant assessment of amniotic fluid volume. Interobserver and intraobserver variation.
Arrangement for increasing the fill factor in a four-quadrant-type detector
Amniotic fluid volume assessment with the four-quadrant technique at 36-42 weeks' gestation
Comparing radical mastectomy with quadrantectomy, axillary dissection, and radiotherapy in patients with small cancers of the breast.
Conservative treatment of early breast cancer. Long-term results of 1232 cases treated with quadrantectomy, axillary dissection, and...