A：I didn't expect to see you at this hour. You must have goofed off again.
这个点无不忘看到你的。你准是开小差了。
B：Goofed off? Maybe, but I'm not a clock-watcher. I finished doing what I should do and then knock off an hour earlier.
开小差?也许吧，可我不是老看钟点等下班的人，我干完了我要干的，提前了一小时下班。
A：You'll be sorry if you the boss finds it out. He may probably give you the bag.
让老板知道了，你就难受了。
B：I'm sure of what I'm doing.
我知道我在做什么。
注释:
at this hour 此时
goof off 游手好闲;吊儿郎当, 偷懒;不认真工作
a clock-watcher 老是看钟等下班的人
knock off 停止做某事, 下班, 匆匆完成
an hour earlier 提前一小时
give sb the bag 让某人吃不了兜着走
be sure of sth 清楚...... 确信