青岛的城市是建在小山坡上的，车开在狭小而干净的山间街道上，一会上升，一会下沉，一会是九十度的转弯。

Qingdao city is built on the hills, he drove in a small mountain and clean streets, one will rise for a sink, one will be turning ninety degrees.

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下沉的时候，肘部要弯曲90度。

Dip to where your elbows are bent at 90 degrees.

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在现有研究基础上，根据井筒内物质平衡原理，建立了基于SIMULINK下沉没度变化规律的动态仿真方法。

According to the principle of material balance in well bores the method of dynamic simulation to describe the changing rules of submergence depth is established in the paper based on SIMULINK.

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