There's this little flicker, and then as he turns it ever so slightly more, the whole of that green line disappears, and instead there are these little sort of inky dust devils close to the needle.
绿线开始有些时隐时现，然后随着水流的持续增大， 绿线彻底消失了，与此同时 在针头附近出现了一些小小的被绿色墨水浸透的漩涡。