Lava bubbled a few feet below the lip of the crater.

熔岩在火山口下几英尺处沸腾。

《牛津词典》

The lava will just ooze gently out of the crater.

熔岩只会缓缓地从火山口流出来。

《柯林斯英汉双解大词典》

As of Sunday, occasional rock cascades were the only signs of activity-other than lava flows-within the crater, according to the volcano observatory.

据火山观测站所说，到周日为止，在火山口内，偶尔的岩石小瀑布——而不是岩浆流动——是火山还在活动的唯一迹象。

youdao

Visual observations show the 300m- (1, 000ft) high lava dome within the crater has lifted by about 45m (150ft) and it is continuing to rise.

BBC: Mount St Helens spews out steam and ash on 5 October 2004

Dr Bodenschatz and his team are now scrutinising video footage of the lava lake in the Kilauea crater in Hawaii, to see if its zig-zags are produced by the same pattern of cooling and plate-spreading that is observed in the wax.

ECONOMIST: Geophysics

Visual observations and photographic analysis show evidence of uplift of the scale of tens of metres of part of the glacier in the crater and of the lava dome.

BBC: NEWS | Americas | Mount St Helens on highest alert