a way into 同义词

1 窍门

trick hint

2 诀窍

recipe secret trick

3 敲门砖

stepping stone

相关词

protostar protocol protonation protonic protectiveness protestor protist protectionism protoporphyrin protectant protections proterogyny prothesis protein protonemata protection protocols prothonotary protogyny protogenic protoplast protonotaries proteolytic protectionist proteoglycan prothallium proteinase prothoracic protasis protectorate