source of collapse塌陷: subside; collapse; sink; cav ...源: source; fountainhead塌陷: subside; collapse; sink; cave in 房基塌陷。 the foundations have sunk塌陷，塌陷: tumbling down, tumbling down使塌陷: cave n/vt/vi下载手机词典可随时随地查词查翻译
