In class, we learned that words like "unpackable" have more than one meaning (e.g., 'able to be unpacked' and 'unable to be packed'). This best illustrates:

Question

BlackTom AI · Accepted Answer

The principle of compositionally states that the meaning of a complex expression is determined by the meanings of its parts and the way they are combined. That core idea explains why the single string "unpackable" yields two distinct interpretations.

1) Relevant knowledge points and concepts
- Morphemes: smallest meaning-bearing units (un-, pack, -able).
- Derivational morphology: formation of new words via affixes (un- and -able here).
- Compositionality: semantic interpretation depends on both parts and hierarchical structure (bracketing).
- Scope/attachment ambiguity: different morphological groupings yield different meanings.

2) Complete reasoning process step by step
- Consider two possible morphological bracketings:
  A) [un [packable]] — prefix un- attaches to the adjective packable.
  B) [[unpack] able] — suffix -able attaches to the verb unpack.
- Interpret each structure compositionally: the overall meaning follows from parts plus the structure.

3) Intermediate steps / semantic composition
- For A: packable = "able to be packed"; apply un- as negation: un(packable) = "not (able to be packed)" → "unable to be packed."
- For B: unpack = "to remove packing"; apply -able: able(unpack) = "able to be unpacked" → "able to be unpacked."
- Thus two meanings arise because the prefix/suffix attach in different orders; compositional rules map those structures to different semantic results.

4) Why the correct answer is correct
- The ambiguity directly exemplifies compositionality: identical morphemes produce different overall meanings depending on hierarchical combination. The phenomenon is best explained by the principle that meaning is built from parts and structure.

5) Why other options are incorrect
- Creativity of language: concerns productivity/generativity, not this specific structural source of ambiguity.
- Right-headedness: concerns which morpheme determines syntactic category, not the scope/attachment that creates the two meanings.
- Inflectional morphology: deals with grammatical inflections (tense, number), whereas un-/ -able are derivational affixes producing different lexical meanings.

6) Conclusion
This example illustrates the principle of compositionally, which is the correct answer.

In class, we learned that words like "unpackable" have more than one meaning (e.g., 'able to be unpacked' and 'unable to be packed'). This best illustrates:单项选择题

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