无防护设备的道口的英文：
unprotected crossing

unprotected是什么意思：
a. 无保护[者] 的

People transmit HIV by having unprotected sex, by receiving infected blood transfusion.
爱滋病毒通过没有采取保护措施的性行为以及输入被感染的血在人之间传染。

She was dressed in white, a picture of youth, unprotected innocence, and humble girlish simplicity.
她穿着一身白衣服，显得年轻美貌、天真烂漫，像个又温顺又单纯的姑娘。

They would take possession of any unprotected loophole, and shoot us down like rats in our own stronghold.
他们将占用任何一个没有防卫的枪孔，把我们象耗子一样地射死在我们自己的据点内。

Don't brush your teeth or floss immediately before you are likely to have unprotected oral sex.
口交前避免刷牙或使用牙线。

The captain's order to mount at once and ride for Doctor Livesey would have left my mother alone and unprotected, which was not to be thought of.
如果我听从船长的吩咐，立刻骑马去找利维塞大夫，那我就不得不将母亲孤立无援地独自留在家中，所以这个办法连想都不用想。

crossing是什么意思：
n. 渡口；过境处；人行横道，十字路口；横渡；杂交
v. cross的现在分词

No cross, no crown.
没有磨难，就没有皇冠。

Use the zebra crossing to cross the road.
走斑马线过马路。

mark one's cross
画押，画十字

They ought to stop at the pedestrian crossing.
他们该停在人行横道上。

Our letters crossed in the post.
我们的信在邮寄途中错过去了.