Regular tetrahedron
正四面體
?? 詞語組成解析
regular
['r?gj?l?]
adj. 有規(guī)律的;規(guī)則，整齊的;不變的;合格的;
n. 正規(guī)軍;主力（或正式）隊(duì)員;常客;
adv. 定期地;經(jīng)常地;
reg國(guó)王+ular...的 → 國(guó)王統(tǒng)治的 → 規(guī)則的
tetrahedron
[[?tetr?'hi:dr?n]]
n. 四面體
??? 情景例句
Remember,
別忘了，
Keep thing seven years and you will find a use for it.
備而不用。
There's something wrong woth your ears. I think there's something near us.
你的耳朵有點(diǎn)毛病！我想我們附近有什么東西。