“阶”怎么读？

夫妇俩进去之前在门阶上简短地说了几句.The couple chatted briefly on the doorstep before going inside.实验室最近经过更新，可以上更高阶的课程了。The lab has recently been updated to allow for more advanced courses.将空奶瓶放在门阶上。Leave empty milk bottles on the step....

“阶”的英语可以翻译为：steps，stairs，rank，[医]scala ...