从12月份开始就一直在那里，慢慢的在St Croix和St Thomas之间交叉往来65公里，周期性的浮出水面再潜回4000米的深处。
It has been there since December, slowly criss-crossing the 65km between St Croix and St Thomas, periodically surfacing and then diving back down again to depths of 4, 000 metres.
youdao