When he tested an early vaccine on himself, some described the act as foolhardy.

当他在自己身上试验还处于初级阶段的疫苗时，有些人说他的行为是莽撞的。

《柯林斯英汉双解大词典》

When he tested an early vaccine on himself, some described the act as foolhardy.

当他在自己身上试验还处于初级阶段的疫苗时，有些人说他的行为是莽撞的。

《柯林斯英汉双解大词典》