cannot clap with one hand;alone and helpless;A single palm cannot clap.;It is difficult [impossible] to make a clap with one palm [hand]. ;

Knowing supply without knowing demand accomplishes little , like a scissors or one hand clapping.
只了解供给而不了解需求, 就像半把剪刀或孤掌难鸣一样,很难说明全貌.
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