短语词组短語slack -off weight 下放時鑽具重量slack k off 滯銷Slack off the sail 把帆放松Slack Off A Little 放松一點Don T Slack Off 不要媮嬾to slack off 松懈slack off weaken 由強轉弱slack off in study 學習松懈slack off test 慢鑽試騐 返回 slack off