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Unless 即“除非”的意思。比如：
Joe can't hear unless you shout.
除非你大声吆喝，否则Joe听不到。或者说，
只有你大声吆喝，Joe 才能听到。

Don't tell Ann what I said unless she asks you.
别告诉Ann，除非她问你。

As long as; Provided (that); providing (that) 只要...就

You can use my car as long as you drive carefully.
只要你小心驾驶，我就让你用我的车。

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简单对话

Providing (that) she studies hard, she should pass the examination. 只要努力学习，她就会通过考试。

Traveling by car is convenient provided (that) you have somewhere to park.

只要有地方泊车，开车出行是很方便的。