公众号：悦享英文
only have to...in order to...
只要...就行了
have to
只好，不得已
in order to
为了...
栗子
1.You only have to call her in order to know whether she is in or not.
你只要打个电话就知道她在不在家了。
be in=be at home在家
2.You only have to search the internet in order to get the information of your express delivery.
你只要上网查查就知道你的快递到哪了。
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