The weather in Washington is roughly equivalent to that of the coastal areas of Jiangsu, and similar to that of New York and Tianjin, both of which are relatively hot.

The weather in Boston is similar to that of Yingkou. Sometimes it is very hot and sometimes it is very cool. You need to prepare a jacket.

Los Angeles is in southern California. Summers are not very hot but very dry.

Nowadays, computers, camera chargers, etc. are generally 100-240V universal and do not require a transformer, but a plug-in converter is definitely needed.

There is sales tax on purchases in these areas, and you will have to pay about $105-110 for something priced at $100.

You also have to pay sales tax when eating, and except for fast food, you also need to pay a tip of 15%-20%.