Teacups are kids who are extremely fragile and nuanced to their own discomforts or problems. They have an extremely difficult time handling criticism or rejection and tend to fear anything that they might not succeed in. When they get to difficulties in jobs or in life, they tend to breakdown.

Teacup（茶杯型）是指心理极其脆弱、不堪一击的人，这些人过分专注于自己的不适或是问题。他们很难接受别人的批评或是拒绝，他们害怕一切可能的失败。当他们在工作或生活中遇到难题时，他们往往会崩溃。

For example:

Toughen up, teacup. No matter how brilliant you think you may be, the day will come when you will be told in no uncertain terms that you are laughably wrong. Will you cry?

坚强点，不要像个茶杯一样脆弱。不管你认为自己多聪明，总有一天，生活都会毫不留情地告诉你你是错的。到时候你怎么办，坐下来哭吗？