Don't fumble with it.
别毛手毛脚。
His awkwardness made him fumble with the key.
由于尴尬不安，他拿钥匙开锁时显得笨手笨脚。
It amounts to the second big battery technology fumble the United States has been involved with.
它相当于美国涉及的第二大电池技术摸索。
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