观察诊断检查

Shadow a Diagnostic Check

0%

You choose to follow Han Lei to an SUV that has a mystery engine problem. It's time to see the logic detective in action.

Redo Lesson?

This will reset your comprehension score for this attempt. Your past scores are safely stored.

Writing Practice

Select Language

Log In

Create a free account to track your progress, practice vocabulary, and save your lessons.

Don't have an account?

Upgrade to Premium

Unlock offline downloads, full access to all series, and support new development.

  • Download lessons for offline study
  • Access the entire UseYu content library
  • Offline drills for up to 500 words
  • Support the development of new content
Tell me more

Install in Two Steps

Add UseYu to your home screen for a full-screen experience, faster loading, and robust offline access.

1. Tap the Share icon
2. Then, select 'Add to Home Screen'
Add to Home Screen

Language & Script Guide

What is Mandarin?

Mandarin is the official language of Mainland China and Taiwan, and one of the official languages of Singapore. It is the most widely spoken Chinese dialect globally.

What is Cantonese?

Cantonese is the primary language spoken in Hong Kong, Macau, and the Guangdong province of China. It is also widely spoken in overseas Chinese communities.

What is Simplified Chinese?

Simplified Chinese characters were created to increase literacy rates by reducing the number of strokes. They are officially used in Mainland China and Singapore.

What is Traditional Chinese?

Traditional Chinese characters retain their historical shapes and strokes. They are primarily used in Taiwan, Hong Kong, and Macau.

Which should I choose?

If you plan to visit Mainland China or want to speak with the largest number of people, choose Mandarin + Simplified. If you are interested in Hong Kong culture, media, or visiting Macau, choose Cantonese + Traditional.

Scholar

1

Commoner

白丁 (Bai Ding)
0 XP 100 XP to Tong Sheng

Lifetime Experience

0 XP
Learning 0
Review 0
Interaction 0

Learning Stats

0 Lessons Completed
0 Vocab Seen
0 Drills Completed
0 Lessons Passed (70%+)
0 Vocab Mastered
0 Drills Passed (70%+)

Activity Dashboard

🔥
0 Current Streak
🏆
0 Longest Streak

Last 7 Days

Loading activity...

Last 365 Days

Loading heatmap...
First of the month
Less
More
Time until next day 00:00:00

Contexts & Encounters

You have encountered in the following lessons:

Link Asset to Content

Media Library
Upload New
  • Cover Image (cover)
  • Thumbnail (thumbnail)
  • Intro Slide (intro_slide)
  • Outro Slide (outro_slide)
  • NPC Avatar (avatar)

Remove Asset

Choose how you want to remove this asset.

Send to Recycle Bin

This will remove the file from all linked content and send it to the Recycle Bin.
Free Lesson 5 of 6

Keep Your Hard-Earned Progress

You've completed 5 of your 6 free preview lessons. Create a free account to make sure your vocabulary and XP are saved.

5 / 6 Free Lessons Completed
🧠
Personalized Word Deck & Drills Lock newly discovered words into long-term memory with smart intervals.
🔥
Streak & Character Mastery Tracking Never lose your reading stats or vocabulary across any device.
📖
Save & Sync Stories Anywhere Enjoy foundational series and standalone stories in the library.

Unlock the Rest of the Story

You've reached the end of the free preview. To see what happens next, upgrade to UseYu Premium.

  • Unlock all branching paths and reading segments
  • Download titles for offline study
  • Offline drills for up to 500 words
  • Support the development of new content
官 · 简 · 1.0x

Language Settings

Mandarin
Cantonese
Simplified
Traditional

Speech Settings

Playback Speed
1.0x
Auto-Slow Rate
25%