Many challenges remain and much uncertainty continues to cloud the outlook.

尚存诸多挑战，不确定性依然，前景不明。

youdao

Many challenges remain and much uncertainty continues to obscure the outlook.

尚存诸多挑战，不确定性依然，前景不明。

youdao

In theory stem cells offer the hope of growing new tissues to order, yet in reality, many challenges remain.

理论上，干细胞可以生长出新组织，但在实际中还存在许多挑战。

youdao

While many challenges remain, Egypt has come a long way in the past year, and we hope that all Egyptians will commemorate this anniversary with the spirit of peace and unity that prevailed last January.

WHITEHOUSE: Statement by the Press Secretary on Egypt��s Transition to Democracy | The White House

Though much has been accomplished, many more challenges remain ahead of us.

WHITEHOUSE: White House 2012 Tribal Nations Conference: Helping Indian Country Move Forward | The White House

Many difficult challenges remain, however, and all government officials and Senators are advised to use caution and consideration before they take actions that may harm the security of this nation.

CENTERFORSECURITYPOLICY: The way forward for Senate and DHS