Utilizable means that a thing can be used — that it is in a state where you are able to put it to work for some purpose. It is the adjective you get by adding -able to the verb utilize. Here is the honest part: it is a real English word, and you will find it in dictionaries, but it is rare, and most native speakers would simply say usable. The two mean almost the same thing. Where a small difference shows up, utilizable leans towards 'can be taken and turned into something useful, put into a system, made productive' — you meet it in technical writing about energy, land, resources, materials, waste: utilizable heat, utilizable water. Usable is the everyday word for 'not broken, you can use it': a usable chair, a usable password. Because utilize already sounds formal and slightly official, utilizable sounds doubly so. In reports, engineering papers and government documents it fits. In an essay, in an email, in speech, it will sound heavy, and many editors would cross it out and write usable. So: know it when you read it; reach for usable when you write. That advice is not about the word being wrong — it is about sounding like a person rather than a manual.

可利用的、可加以運用的（≈ usable 可用的，但更正式、多見於技術或資源方面的書面用語）