鞋带尾的塑胶
[xié dài wĕi de sù jiāo]
'鞋带尾的塑胶' literally refers to 'Plastic Tip of Shoe Laces'—a minor yet significant part that helps hold shoelaces together. Metaphorically it may suggest something or someone unsung but necessary; doing its job without seeking attention. Also it can represent an ordinary appearance concealing deeper purpose.