Recent surveys show that the length of a sand plug to prevent flash-over is considerably greater than hitherto reckoned with . 最近的研究表明，用来防止殉爆的沙柱长度，远比目前所想像很大。
2.
I came to a stone where the highway branches off on to the moor at your left hand ; a rough sand pillar , with the letters w . h . cut on its north side , on the east , g . , and on the south - west , t . g 我来到有一块大石头的地方，那儿大路岔开，左手一边通到荒野，有一根粗糙的沙柱，北面刻着wh ，东面是g ，西南面是tg 。
