How to pronounce 頭號 in Cantonese (4 out of 5):

美國的頭號威脅--中國
The number one threat to the United States -- China.

Cantonese Sentence Breakdown

美國 mei5 gwok3
America
dik1
of
~'s (possessive particle)
(used after an attribute)
(used to form a nominal expression)
(used at the end of a declarative sentence for emphasis)
truly
really
indeed
target
to lift up
few
small
to fetch
to move
to get
to pick up
to force
頭號 tau4 hou6
number one
威脅 wai1 hip3
a threat
中國 zung1 gwok3
China