# the Lamb

A "lamb" is a young sheep. Here is it used symbolically to refer to Christ.

# fell down

"lay down on the ground." Their faces were toward the ground to show that they were worshiping the Lamb. They did this on purpose; they did not fall accidentally.

# Each of them

Possible meanings are 1) "each of the elders and living creatures" or 2) "each of the elders."

# a golden bowl full of incense, which are the prayers of God's holy people

The incense here is a symbol for the believers' prayers to God.