filler 填装物，填塞物
filler words 填充词
A filler word is a word or phrase that has no real meaning, it just gives the speaker a chance to pause during conversation.
填充词没有实际的含义，当你在聊天的间隙突然忘词，词穷或者需要思考的时候，用来填补这段时间的一些词和句子。
They are also useful because they can help you to sound more like a native speaker. It just helps making your language sound more natural and relaxed.
同时它会让你的英文听起来更加地道，更加自然放松。

Umm…
He said "umm... I don't get it" after the teacher gave them the work.
老师布置下来作业之后，他说：额，我没有太明白。
Q:Do you remember where he went?
你记得他去哪了吗？
A:Umm, I think that he went to the shop.
额，他应该是去商店了。

like
A:Do you know how to get there?
你知道怎么去那里吗？
B:Yes, I'm like, pretty sure that it's on like, this way.
知道啊，我非常确定，是从这边过去。

actually 加强语气
Actually, I think dogs are really cute.
我真的觉得狗狗非常地可爱！

at the end of the day
最终，到头来，归根结底
At the end of the day, he's a great friend.
到头来发现他是一个很好的朋友。
At the end of the day, you've got to speak up for yourself.
到头来，你还是得自己站出来为自己说话。

you know
He was really funny, you know?
他真的很有意思你知道吗？