weak reference
弱い参照
Soft reference
Phantom reference
Circular reference
Ephemeron
/suto3/google.iconweak reference
/suto3/Google画像検索.iconweak reference
/suto3/Google定義検索.icon weak reference
/suto3/wikipedia.iconweak reference
/suto3/weblio.icon weak reference
/suto3/kotobank.icon weak reference
/suto3/jisho.icon weak reference