1 to learn

2 to master

3 institute

4 learned society

5 (scholarly) association

1 to challenge

2 challenge

1 can

2 to be possible

3 to be able to

4 will

5 to be likely to

6 to be sure to

7 to assemble

8 to meet

9 to gather

10 to see

11 union

12 group

13 association

14 classifier: 个 gè

15 a moment (Taiwan pr. for this sense is [huǐ])

1 opportunity

2 chance

3 occasion

4 classifier: 个 gè

1 society

2 classifier: 个 gè

1 war on all sides (idiom); fighting from all four quarters

1 can be understood, but not described (idiom, from Zhuangzi 莊子|庄子); mysterious and subtle

1 can be understood, but not described (idiom, from Zhuangzi 莊子|庄子); mysterious and subtle

1 lit. to go among enemies with only one's sword (idiom)

2 fig. to go alone into enemy lines

1 there is no such thing as a free lunch (idiom)