Each pupil is free to decide which group he or she wants to join.

每个学生可以自由决定他或她想加入哪个小组。

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They are free to join.

他们随时可以加入。

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He urged other nations to join in an effort to free the world of nuclear weapons.

VOA: special.2009.04.11

Clay proposed that California join the Union as a free state.

VOA: special.2009.03.19

" ...when all of God's children, black men and white men, Jews and Gentiles, Protestants and Catholics, will be able to join hands and sing in the words of the old Negro spiritual: Free at last! Free at last!

VOA: special.2010.04.16

Guests can join free yoga on the lawn, and a pool is planned.

BBC: Mini guide to Hong Kong

One would expect, therefore, that environmental activists would join free-market advocates opposing government obstruction of natural gas production.

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Others will join free contests.

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