đi vào gia nhập 
enter 
She does not have the duty to join the army. ☊ 
Cô ấy không có nghĩa vụ gia nhập quân đội. ☊ Politics like: gia nhập → →
der Anfänger ☊ người mới bắt đầu, người mới học, người mới gia nhập ☊ 
☊ Italy joined the war on the Allied side in 1915. ☊ allied ☊
I've had my doubts about his work since he joined the firm. ☊ have your doubts (about sth) ☊
countries seeking entry into the European Union ☊ entry ☊
The country applied for full membership of the European Union. ☊ full ☊
interested (in doing sth): Anyone interested in joining the club should contact us at the address below. ☊ interested ☊
to join the ranks of the unemployed ☊ join ☊
Who is eligible to apply for membership of the association? ☊ membership ☊
He's joined the navy/the Navy. ☊ navy ☊
He's gone over to the enemy (= joined them). ☊ over ☊
I've joined the ranks of the unemployed (= I've lost my job). ☊ the unemployed ☊
I've joined the union. ☊ union ☊