1 certainly

2 must

3 will

4 necessarily

1 to have to

2 must

3 compulsory

4 necessarily

1 there is no need

2 why should

1 essential

1 to be certain of victory

2 to be bound to prevail

1 lit. if three walk together, one can be my teacher (idiom, from the Analects of Confucius)

2 you have sth to learn from everyone

1 lit. when two tigers fight, one is sure to be wounded (idiom)

2 fig. if it comes to a fight, someone will get hurt

1 He who gives no thought to far-flung problems soon finds suffering nearby (idiom, from Analects).

2 Smug concentration on the here and now will lead to future sorrow.

1 if two tigers fight, one will get injured (idiom)

2 if you start a war, someone is bound to get hurt

1 when two tigers fight, one will get injured (idiom)

2 if it comes to a fight, someone will get hurt.