giúp với ạ

It appears there are some jumbled words and sentences in your question. Based on the provided words and their International Phonetic Alphabet (IPA) notations, I'll try to make sense of it. The sentence seems to be: "Cheetahs are faster than cats, and our pencil is shorter than my pencil." Now, let's analyze the IPA notations for the word "than", which is provided twice with the same notation: ðən. The "ð" symbol in the IPA notation represents a voiced th sound (the 'th' in 'this'), and "ə" is a schwa sound, which is a neutral, mid-central vowel sound. Considering the context of the sentence, the word "than" seems to be correctly used for comparisons.