just then和at the moment有何区别

just then:正在那时
例句与用法:
1. Just then, our hostess whirled me away to meet some of the other guests.
正在那时,女主人迅速带我到别的地方去见其他的一些客人.

2. Just then the door opened and that silly woman from next door waltzed in.
正在那时门开了,那个傻女人从隔壁房间愉快地走了进来.

3. Just then a bright idea occurred to me.
正在那时候,我想到一个妙主意.

at the moment:此刻
例句与用法:
1. I'm not in her good graces at the moment.
我此刻尚未讨得她的欢心.

2. I'm not disposed to meet them at the moment.
我不打算在此刻会见他们.

3. He's dealing with his post at the moment.
他此刻正在处理信件.

4. There seems to be a dearth of good young players at the moment.
目前似乎好的年轻选手太少了.