英译中（Translate）：bound energy（）

结合型药物（bound drug）

Illustrate free morpheme and bound morpheme.

Morphemes can be sub-classified according to their capacity of occurring alone．Those that may occur alone, that is, those which may make up words by themselves, are free morphemes． For example, dog, nation and close are free morphemes．In contrast, those that cannot occur alone and must appear with at least another morpheme, are called bound morphemes．For example, dis-, -ed are bound morphemes．

bound morpheme

Bound morpheme refers to those which cannot occur alone and must appear with at least one other morpheme. For example, the word distempered has three morphemes, namely, dis- and -ed are two bound morphemes. There are two types of morphemes which fall into the "bound" category: derivational morphemes and inflectional morphemes.

This sort of thing is bound to happen.

A:sure B:quick C:fast D:swift

Our lives are intimately bound up with theirs.

A:tensely B:nearly C:carefully D:closely

This sort of thing is{{U}} bound {{/U}} to happen.

A:sure B:quick C:fast D:swift

Our lives are intimately bound up with theirs.

A:tensely B:nearly C:carefully D:closely