self-evident
adj
clear without any need for proof, explanation, or further evidence; obvious 不证自明的; 不言而喻的; 明显的
a,self-evident `truth, `statement, `fact 不证自明的真相、 不言而喻的说法、 明摆著的事实
Her sincerity is self-evident. 她真心实意, 这是显而易见的.
Alternatively, if the star were small, the life-supporting planet would have to have a close orbit round it and also provide the perfect conditions for life forms to develop.