令某人失望的是 to one's disappointment
令我大为失望的是 I am greatly disappointed that
令失望的是
To my disappointment
以上为机器翻译结果，长、整句建议使用 人工翻译 。
youdao
令父母失望的是，菲尔和帕姆都再也不去教堂了。
To the chagrin of their parents, neither Phil nor Pam went to church anymore.
《柯林斯英汉双解大词典》
但是令所有人失望的是，煤核可可豆壳混合物燃烧之后并没有使空气闻起来像巧克力那般甜美了。
But to everyone's disappointment, coal and cocoa shells burned together do not fill the air with the sweet smell of chocolate.
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