Tetrahedra
n. 四面體 (tetrahedron的變形)
??? 情景例句
I Wonder whether they will arrive on time.
我也不知道他能不能準時到。
This part of the country is very hilly.
這個國家這一部分有很多丘陵。
But this is not a business that can be undertaken in a day or swiftly improvised by a mere command of the will.
但這并非一日之功，也不是單憑意志一蹴而就的事。