刑法中許多的犯罪類型，在因果關係的判斷上遇到了顯著的困難，因此，立法者在犯罪的構成要件設計上發展出了「足以」的語言符號。然而此一語言符號卻與傳統刑法釋義學上危險犯所使用的語言符號，卻有所差異。借助於適性（如「足以」的用語）的構成要件特徵進一步標記了特定的密切關聯，相對於立法者於其他條文中所設計的實害犯罪，在這些被歸類為適性犯的構成要件中，最終一個法益侵害的結果是未明顯被預見的，而就這點而言無論如何都涉及到單純的危險犯概念思考。 上述犯罪類型究屬具體危險犯、抽象危險犯，或是可以歸入第三種型態的危險犯，從「足以」的語言符號解釋以觀，仍處於一個不清楚且懸而未定的狀態。因此，澄清這個問題，不僅是釋義學上的關注點，同時也具有實際的意義，此即為本計畫的核心目標。 In the hermeneutics development of the risk offenses is usually assumed a dichotomy, on the one hand, the abstract, and on the other are the specific hazards offenses. There are many types of crime in Criminal law, Practical encountered significant difficulties on determining the causal relationship. Therefore, the Legislators developed a “sufficient” linguistic sign. In the design of the “sufficient”, Legislators use it to present specific closed connection between act and dangerous. In other words, by requiring the validity scope of an act within, fact in practical lead to a specific result against the legal interests, to replace the traditional causal relationship judgments. In short, relative to other provisions, which the actual harm results happened in crime. Those classified as sufficient for the constituent elements of the offense, a legal interest against the final actual result is not obvious to be predictable, for that, the concept of abstract endangerment offenses is definitely to be involved. Whether the solution is the specific hazards offenses, the abstract endangerment offenses or even a third type of crime. It leaved an issue in interpretation of the linguistic sign “sufficient”. Therefore, it should be meaningful to research and clarify this important issue both on hermeneutics and practical.