diff --git a/package.json b/package.json
index bf44c3e..10823cb 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "tex2typst",
-  "version": "0.0.16",
+  "version": "0.0.17",
   "description": "JavaScript library for converting TeX code to Typst",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",
diff --git a/src/parser.ts b/src/parser.ts
index 1039844..0f65a75 100644
--- a/src/parser.ts
+++ b/src/parser.ts
@@ -101,10 +101,11 @@ export function katexNodeToTexNode(node: KatexParseNode): TexNode {
                 if (right === "\\}") {
                     right = "}";
                 }
+                const is_atom = (str:string) => (['(', ')', '[', ']', '{', '}'].includes(str));
                 res.args = [
-                    { type: 'atom', content: left },
+                    { type: is_atom(left)? 'atom': 'symbol', content: left },
                     body,
-                    { type: 'atom', content: right}
+                    { type: is_atom(right)? 'atom': 'symbol', content: right}
                 ];
                 break;
             }
diff --git a/src/writer.ts b/src/writer.ts
index 7a094ef..b9eff47 100644
--- a/src/writer.ts
+++ b/src/writer.ts
@@ -132,7 +132,7 @@ export class TypstWriter {
         } else if (node.type === 'leftright') {
             const [left, body, right] = node.args!;
             // These pairs will be handled by Typst compiler by default. No need to add lr()
-            if (["[]", "()", "{}"].includes(left.content + right.content)) {
+            if (["[]", "()", "{}", "\\lfloor\\rfloor", "\\lceil\\rceil"].includes(left.content + right.content)) {
                 this.append(left);
                 this.append(body);
                 this.append(right);
diff --git a/test/symbol.yml b/test/symbol.yml
index 3965483..fa9324a 100644
--- a/test/symbol.yml
+++ b/test/symbol.yml
@@ -79,14 +79,14 @@ cases:
     tex: \binom{n}{k}
     typst: binom(n, k)
   - title: unpaired left and right floor, ceil 1
-    tex: \lfloor \rceil
-    typst: ⌊ ⌉ 
+    tex: \lfloor \rceil \left \lfloor \frac{1}{2} \right \rceil
+    typst: ⌊ ⌉ lr(⌊ frac(1, 2) ⌉)
   - title: unpaired left and right floor,ceil 2
-    tex: \rfloor \lceil
-    typst: ⌋ ⌈
+    tex: \rfloor \lceil \left\lceil \frac{1}{2} \right \rfloor
+    typst: ⌋ ⌈ lr(⌈ frac(1, 2) ⌋)
   - title: paired left and right floor,ceil
-    tex: \lfloor x \rfloor \lceil x \rceil
-    typst: floor(x) ceil(x)
+    tex: \lfloor x \rfloor \lceil x \rceil \left\lceil \frac{1}{2} \right \rceil 
+    typst: floor(x) ceil(x) ceil(frac(1, 2))
   - title: trigonometric functions
     tex: \sin \cos \tan \cot \sec \csc
     typst: sin cos tan cot sec csc