一，文字逐行顯示

HTML：

<div className="LetterToFuture__homeTexts">
     {Array.from(new Array(5)).map((_, idx) => (
       /* eslint-disable-next-line react/no-array-index-key */
          <div key={idx} className="LetterToFuture__homeText" />
      ))}
 </div>

CSS：由於字型效果比較特殊，所以每行文字採用的是圖片

$fadeInDur: 1500ms;
$textWidth: "231px", "124px", "97px", "96px", "213px";

.LetterToFuture__homeTexts 
 
{
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
}

.LetterToFuture__homeText {
  background: url(../../images/text_1.png) no-repeat center center / 100% 100%;
  height: 15px;
  margin-top: 25px;
  animation: slide-up-in #{$fadeInDur} ease-out both  1/*infinite
 
*/;

  &:nth-child(1) {
    margin-top: 15px;
  }

  /* 官網的 list.nth 寫法 not working - https://stackoverflow.com/questions/53155503/how-to-find-the-scss-index-of-the-element-in-the-list */
  /*@debug list.nth([line1, line2, line3], -1);*/
  /*@debug list.nth(10px 12px 16px, 2);*/
  /*@debug "------------------------------------------------------------------------------------------";
 
*/
  /* 正常 */
  /*@debug nth($textWidth, 1);*/

  @for $idx from 1 through 5 {
    &:nth-child(#{$idx}) {
      animation-delay: #{($idx - 1) * $fadeInDur};
      background-image: url(../../images/text_#{$idx}.png);
      width: #{nth($textWidth, $idx)};
    }
  }
}

@keyframes slide-up-in {
  0% {
    opacity: 0;
    transform: translate(0, 15px);
  }

  100%  {
    opacity: 1;
    transform: translate(0, 0);
  }
}

以上實現效果是：每行文字位移由下至上，透明度從0到1，逐漸顯示，如果你不想要位移變化，將css裡位移相關程式碼去掉即可。

二，文字逐個顯示

HTML：

<div className="WorldBookDayQuestionOne__textWrap">
    {text.split('').map((t, idx) => (
         /* eslint-disable-next-line react/no-array-index-key */
      <span key={idx} className="WorldBookDayQuestionOne__text">
                {t}
       </span>
     ))}
</div>

CSS：

$fadeInDur: 1500ms;

.WorldBookDayQuestionOne{
 
  &__textWrap {
    width: 150px;
    margin: 0 auto;
    margin-top: 100px;
    background-color: burlywood;
  }
  &__text {
    opacity: 0;
    animation: fade-in #{$fadeInDur} ease-out both  1/*infinite*/;
    @for $idx from 1 through 50 {
      &:nth-child(#{$idx}) {
        animation-delay: #{($idx - 1) * $fadeInDur};
      }
    }
  }
}

@keyframes fade-in {
  0% {
    opacity: 0;
  }

  100%  {
    opacity: 1;
  }
}

以上實現效果是：文字透明度由0到1逐個顯示，當一行顯示不下的時候會自動往下一行摺疊，一行顯示多少文字取決於父元素容器大小。