Chris is pinning his hopes on getting into Yale.

【pin】克里斯把希望寄托在进耶鲁大学上。

Secretary Pompeo believes the U.S. demands are not unreasonable, though he does seem to be pinning his hopes on regime change in Iran.

国务卿蓬佩奥认为美国的要求并非不合理，不过看起来他的确把希望寄托在伊朗政权更迭上。