css3 – 如何保留SASS / SCSS mixin的括号？

@mixin fadeup ($direction,$value) {
  transform: translate#{$direction}unquote("("#{$value}")");
}

.foo {
  @include fadeup(X,100pX);
}

.bar {
  @include fadeup(Y,100pX);
}

编译为：

.foo {
  transform: translateX(100pX);
}

.bar {
  transform: translateY(100pX);
}