.article-bil-column {
  display: inline;
  float: left;
  width: calc(50% - 10px) /* 每欄各佔寬 50%， 邊界預留 10px 空白 */;
}
.article-bil-column.bil-first-column {
  padding: 0 10px 0 0;
}
.article-bil-column.bil-second-column {
  padding: 0 0 0 10px;
}