on all fours 这个短语很好理解，这里的four就是指两只手和两个膝盖，四肢全部落在同一平面，就是匍匐、趴着的样子。 with your hands and knees on the ground 趴在地上，匍匐着 例： You'll have to get down on all fours to clean behind the toilet. 你得趴到地上才能擦洗到马桶后面的区域。 He walked toward the ship until his w