.box{
    width: 200px;
    height: 100px;
    text-align: center;
    background: red;
}
.content{
    display: inline-block;
    color: white;
    text-align: left;
}

<div class="box">
    <div class="content">測試測試測試測試測試測試測試測試</div>
</div>

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