conditional是什么意思？

If a situation or agreement is conditional on something, it will only happen or continue if this thing happens.

In grammar, a conditional clause is a subordinate clause which refers to a situation which may exist or whose possible consequences you are considering. Most conditional clauses begin with 'if' or 'unless', for example 'If that happens, we'll be in big trouble' and 'You don't have to come unless you want to'.