1.
No trespassing, ie as a warning sign.
严禁擅自进入（告示用语）.
2.
The children entered the concert without permission.
小朋友擅自进入音乐会。
3.
walk in, help unbidden
擅自进入、主动帮助
4.
He accused me of trespassing on his estate.
他控告我擅自进入他的庄园.
5.
The landowner ordered the trespasser off his premises.
地主命令擅自进入他的宅地的人离开。
6.
crash the party
擅自闯入集会, 不请而至
7.
Please excuse my intrusion.
请原谅我擅自进来。
8.
permit others to enter taxi without permission of hirer
未经车上乘客同意而擅自容许其它人等进入的士车厢内
9.
The squatters had to surrender the building after the police moved in.
警察进入后这些擅自占住者不得不放弃这座楼房。
10.
those who import or export psychotropic drugs without authorization.
未经批准擅自进口、出口精神药品的。
11.
No person that enters into the forest and its adjacent area shall, without authorization, remove or damage marks that serve the forestry sector.
进入森林和森林边缘地区的人员，不得擅自移动或者损坏为林业服务的标志。
12.
He crashed into army exercises and was blown to bits
他擅自闯入军事演习区而被炸得粉身碎骨。
13.
Offense of Importing Solid Wastes Without Authorization and Offense of Smuggling Solid Wastes;
擅自进口固体废物罪与走私固体废物罪
14.
Outside the mystical place all sets up a stele " entering without permission will die",but one who goes in generally is all right.
神秘之地外面都立个石碑“擅入××者死”，不过进去一般都没事。
15.
one who is away or absent without leave.
擅自离去或擅离职守的人。
16.
Setting up any vessel dismantling plant to dismantle vessels without holding an environment affection report (form) that has been approved;
未持有经批准的环境影响报告书（表），擅自设置拆船厂进行拆船的；
17.
Article 9 The goods imported by Chinese-foreign cooperative enterprises with a tax reduction or exemption may not be sold or transferred without authorization.
第九条 中外合作经营企业减、免税进口的货物，不得擅自出售或转让。
18.
They entered the area without permission.
他们未经许可擅入该地.