n.
a resource
"visual aids in teaching"
同义词：assistancehelp
the activity of contributing to the fulfillment of a need or furtherance of an effort or purpose
"rescue party went to their aid"
同义词：assistassistancehelp
a gift of money to support a worthy person or cause
同义词：economic aid
the work of providing treatment for or attending to someone or something
同义词：careattentiontending
