I think a regular visitor's visa should suffice. With this visa, you can stay in the United States for up to 90days.

我认为旅游签证就已经足够了，有了这张签证，你可以在美国待上90多天。

youdao

Travelerscoming to the us from visa waiver countries for business purposes, 90days or less, may be eligible to visit the us without a visa.

游客来到美国免签证国家用于商业目的，90天以内，可以申请访问美国无签证。

youdao

If either of the two parties asks for a new contract, it should forward its request to another party 90days prior to the expiration of the contract, and sign the new contract with mutual consent.

当事人一方要求签订新合同，必须在本合同期满90天前向另一方提出，经双方协商同意后签订新合同。

youdao

If either of the two parties asks for a new contract, it should forward its request to another party 90days prior to the expiration of the contract, and sign the new contract with mutual consent.

当事人一方要求签订新合同，必须在本合同期满90天前向另一方提出，经双方协商同意后签订新合同。

youdao