chắc 
solid like: solide → →
solide ☊ 
rắn chắc ☊ 
☊ solide ☊ 结实的 ☊ jiē shí de His arguments have a sound economic base. ☊ base ☊
disapprove sth: A solid majority disapproves the way the president is handling the controversy. ☊ disapprove ☊
The firm's finances are basically sound. ☊ finance ☊
Respect and friendship provide a solid foundation for marriage. ☊ foundation ☊
a strategy based on sound commercial logic ☊ logic ☊
His advice was always solid and practical. ☊ solid ☊
This provided a solid foundation for their marriage. ☊ solid ☊
a substantial house ☊ substantial ☊
Most of the students have a sound understanding of English grammar. ☊ understanding ☊