她的论点缺乏实质性证据，显得非常薄弱。
Her argument was ___insubstantial and lacked solid evidence.
这些建议听起来很空洞，缺乏实质内容。
The suggestions sounded ___insubstantial and lacked concrete details.
他的论据缺乏实质性内容，显得空洞无力。
His argument was ___insubstantial, lacking solid evidence to support it.
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