experiment

Set your sights high, first establish a trade then set up a family

Set your sights high, first establish a trade then set up a family (1966, February)

Cultivate meticulously

Cultivate meticulously (1972, October)

Experimental fields

Experimental fields (1975, June)

Science can be dangerous and difficult, bitter struggles can set new standards

Science can be dangerous and difficult, bitter struggles can set new standards (1979, April)

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