它欲前又止，羞涩腼腆，就像我的小孙女，倚在门口，偷偷往里瞅，又一下子跑开了，不见踪影，从门厅传出她咯咯的笑声。

It pauses, overcome by shyness, like my grandchild at the door, peeping in, ducking out of sight, giggling in the hallway. "I."

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随着活塞现在位于下止点且所有气体已经燃烧，重要的是要在工作循环的第四个即最后一个冲程中将所有的已燃废气从气缸中排出。

With the piston now at BDC and all the gases having been burnt, it is important to remove all the burnt gases from the cylinder on the fourth and final stroke of the cycle of operations.

youdao

再往前直走，一座优雅的盘旋而上的苍白大理石石阶从昏暗的水中升起在他们头顶约十英尺的地方戛然而止。

Straight on, a tilted stairway of pale marble rose up out of the dark water in a graceful spiral, ending abruptly ten feet above their heads.

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