You can picture bass as the very bottom shelf of sound — the deepest, thickest tones, like a large man's voice so low you feel it in your chest rather than just hear it.
From the word’s history
From Late Latin 'bassus' meaning 'low', its musical use shaped by Italian 'basso'; so bass literally names the low end of pitch.
音樂上的 bass 來自晚期拉丁文 bassus（低），再受義大利文 basso 影響——所以這個字從一開始講的就是「音高裡低的那一端」，跟後來衍生的低音聲部、低音樂器都連得起來。（注意：這個 bass 和意思是「基礎」的 base 其實沒有關係。）
etymonline.com/word/bass (Late Latin bassus 'low', via Italian basso)
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原始詞典資料18 筆記錄
以下是外部詞典記錄的用法，摘錄並精簡格式，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
Bassname/bæs/
- 1
A surname.
- 2
A place name:
- 3
A place name:
- 4
A place name:
- 5
A place name:
- 6
A place name:
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A place name:
bassadj詞源 1/beɪs/
- 1
Of sound, a voice or an instrument, low in pitch or frequency.
- The giant spoke in a deep, bass, rumbling voice that shook me to my boots.
bassnoun詞源 1/beɪs/
- 1
A low spectrum of sound tones.
- Peter adjusted the equalizer on his audio equipment to emphasize the bass.
- 2
entertainmentlifestylemusicA section of a musical group that produces low-pitched sound, lower than the baritone and tenor.
- The conductor preferred to situate the bass in the middle rear, rather than to one side of the orchestra.
- 3
entertainmentlifestylemusicOne who sings in the bass range.
- Halfway through middle school, Edgar morphed from a soprano to a bass, much to the amazement and amusement of his fellow choristers.
- 4
entertainmentlifestylemusicAn instrument that plays in the bass range, in particular a bass guitar, double bass, electric bass, or bass synthesiser.
- The musician swung the bass over his head like an axe and smashed it into the amplifier, creating a discordant howl of noise.
- 5
The clef sign that indicates that the pitch of the notes is below middle C.
- The score had been written without the treble and bass, but it was easy to pick out which was which based on the location of the notes on the staff.
bassverb詞源 1/beɪs/
- 1
To sound in a deep tone.
- […] and the Thunder / (That deepe and dreadfull Organ-Pipe) pronounc'd / The name of Proſper : it did baſe my Treſpaſſe
bassnoun詞源 2/bæs/
- 1
The perch; any of various marine and freshwater fish resembling the perch, all within the order of Perciformes.
bassnoun詞源 3/bæs/
- 1
The fibrous inner bark of the linden or lime tree, used for making mats.
- 2
Fibers from other plants, especially palm trees
- 3
Anything made from such fibers, such as a hassock, basket or thick mat.
- BASS, 1, a door mat
- I set off half-heartedly, as best I could sheltering my spare clothes (which were in the straw fish-bass) under my coat. […] The rain made a channel from my trilby down my neck and one handle of the fish-bass gave way.
摘錄自 英文維基詞典 English Wiktionary，已精簡格式；依 CC BY-SA 4.0 授權使用，改動後的內容同樣以此授權提供。