These terms are similar, but not quite the same. A gadget is a small, useful device. An apparatus is usually a set of materials or equipment designed for a specific use. For example, a fisherman's boat would have a fishing apparatus on it. A can opener is a gadget which is typically used in a kitchen. Patients in hospitals are usually attached to medical apparatuses, like a heartbeat monitor. Your phone, which is a gadget, probably has a picture-taking apparatus on it.
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Has difficulty understanding even short answers in this language.
Can ask simple questions and can understand simple answers.
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