“阶”造句

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.