The important thing is that this is a major breakthrough. “breakthrough” here means an important development or achievement.

Project（71）is an uncertain event or condition that，if it occurs，has a positive or a negative effect on at least one project objective，such as time，cost，scope，or quality．

 ______ twice a year, whether it is a car or a bus or a truck, is the rule that every driver must obey in this city.

Scientists say it may be five or six years _____ this medicine is tested on human beings.

Is this（）longer or shorter?

Every deliberate act of wrongdoing by the master or any of the crew against the ship or cargo，without the authorization or privity of the Shipowner or his agent，is（）.

（）, or drum is used for hauling in or letting out the wires or ropes which will fasten the ship to the shore.

The （） is used for hauling in or letting out the wires or ropes.

The（）may examine or re-examine the goods or take samples from them straightaway in the absence of the consignee or the consignor whenever it considers this necessary.

A mark or place at which a vessel comes under obligatory entry，transit，or escort procedure is know as（）.

If you do not know the subject, you will not understand what is said or written, even if English is your mother （） what is said or written.

Damage to cargo caused by fumes or vapors from liquids，gases，or solids is known as（）.