Dihedral group
[計] 二面體群
?? 詞語組成解析
a. (數)二面的\\nn. 兩面角
group
[ɡrup]
n. 組，團體;群，批;（雕塑等的）群像;（英美的）空軍大隊;
vt.& vi. 使成群，集合;
vt. 分類，歸類;
??? 情景例句
but Richard Stewart is here
但Richard Stewart正在這兒，
Leaves are falling.
葉子落了。
It is then left completely undisturbed with plenty of food and water so that it can absorb the atmosphere of its new home
然后給它以充足的食物和水，一定不要驚擾它，以便讓它能適應新居的氣氛，