From c701db31d297a7c37e7586c6ec5192befaac5e94 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E6=83=B3=E5=87=BA=E7=BD=91=E5=90=8D=E5=95=A6?=
 <55868015+sb-child@users.noreply.github.com>
Date: Sat, 12 Feb 2022 01:16:54 +0800
Subject: [PATCH] typo fix

---
 book/contents/async/getting-started.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/book/contents/async/getting-started.md b/book/contents/async/getting-started.md
index 19141ba9..6def90fe 100644
--- a/book/contents/async/getting-started.md
+++ b/book/contents/async/getting-started.md
@@ -60,8 +60,8 @@
 
 | 操作 | async | 线程 |
 | ---- | ----- | ---- |
-| 创建 | 0.3微妙 | 17微妙 |
-| 线程切换 | 0.2微妙 | 1.7微妙 |
+| 创建 | 0.3微秒 | 17微秒 |
+| 线程切换 | 0.2微秒 | 1.7微秒 |
 
 可以看出，`async` 在线程切换的开销显著低于多线程，对于 IO 密集的场景，这种性能开销累计下来会非常可怕！