3. The model is an odd-looking structure of balls and rolls. 这个模型是由球和杆组成的结构，样子很奇特。
1. not divisible by two
2. not easily explained
3. an indefinite quantity more than that specified
4. beyond or deviating from the usual or expected
5. of the remaining member of a pair, of socks e.g.
6. not used up