我特意问了杨，回答如下

Chen-Ning Yang (杨振宁) is widely regarded as one of the most influential physicists of the 20th century. While ranking scientists is inherently subjective, Yang would typically be placed among the top 25–50 physicists of all time, and in the top 10–15 theoretical physicists of the 20th century, especially when considering his foundational impact on modern physics.