n.環(huán)；輪；體環(huán)；[數(shù)]圓環(huán)域

What touch with vaccinal annulus is adhesive. 用接種環(huán)觸之有粘性。

The thin ring of sunshine encircling the moon during an annular eclipse is called an annulus. 在日環(huán)食期間，繞著月亮的那輪淺淺的太陽(yáng)光就被稱(chēng)為環(huán)面。

n.環(huán)帶物(環(huán)形套筒；圓；圈)