{15點}我想問從香港去美國入境時,要注意什麼!!

yes, 行李 can not put a locker on it. you can tie it up or buy a lugage with offical locker.

go to airline web site, they will post all the items not to bring onbroad.

after 20 some hours air travel, you are brain empty lar... just take easy and fellow other passager go through the customs, make sure you know where's you flight and gate number., drink more water, and not eat oily food.
if you have questions, don't be shy, ask the airline personal, they will happy to help you.

bring a new book or magzine to pass time in the plane, once you find your seat and sit down, go grap some pillow and banket, you will need it when you taking nap. every few hours try to go to restroom or just walk around in the plane,