Train Your Brain

trainyourbrain.ai TYB.ai

Pricing

Homework Help Language Learning AI Image Creation Read Your Adventure Reward System Spelling Tests Questions into Stories

Mathematics Science Language Arts Foreign Languages History Geography

Safety & Monitoring Progress Tracking Learning Preferences

For Teachers Blog

Sign In Sign Up

Features

Homework Help Language Learning AI Image Creation Read Your Adventure Reward System Spelling Tests Questions into Stories

Subjects

Mathematics Science Language Arts Foreign Languages History Geography

For Parents

Safety & Monitoring Progress Tracking Learning Preferences

For Teachers Blog

Sign In Sign Up

🇨🇳 Mandarin Vocabulary 四十多岁

四十多岁

四十多岁

forties

Mandarin → English

← Back to all Mandarin vocabulary

Part of the TYB.AI Learning Lab

We build tools for learners, parents, teachers, and schools across five continents. Explore all our products.

Explore the Lab

Products

Train Your Brain
PollyStop
Read Your Adventure
Summer Ladder

Free Tools

Spelling Tests
Story Library
Learning Games
Image Gallery
Learn
Many More →

For

Parents & Kids
Adult Learners
Teachers
Schools & Districts

Company

Our Story
Careers
Privacy Policy
Terms of Service
Contact

TYB.AI Learning Lab

© 2026 TYB.AI. All rights reserved.