专业英语：7类度量单位

外语天地

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    1. TIME

    1000 milliseconds = 1 second (sec)

    60 seconds = 1 minute (min)

    60 minutes = 1 hour (hr)

    24 hours = 1 day

    7 days = 1 week (wk)

    28, 30 or 31 days = 1 month (mth)

    12 months = 1 year (yr)

    365 days = 1 year

    BUT every 4th year = 366 days (a leap year)

    Also note:

    52 weeks = 1 year (approximately)

    People often use the following terms:

    48 hours (2 days)

    72 hours (3 days)

    2. DISTANCE

    There are two systems for measuring distance in the English-

    speaking world:

    a) metric

    10 millimetres (mm) = 1 centimetre (cm)

    100 centimetres = 1 metre (m)

    1000 metres = 1 kilometre (km)

    b) imperial/US

    12 inches (in) = 1 foot (ft)

    3 feet = 1 yard (yd) (approximately 1 metre)

    1760 yards = 1 mile (approximately 1.6 km)

    3. AREA

    Area is the extent of a surface. It is 2-dimensional. Area

    is often expressed using the word "square" + the distance.

    For example, if a room is 10 metres long and 5 metres wide,

    it is 50 square metres (50 sq. m). But we can also use the

    distance + the figure 2. Then we would write 50m2.

    Here are two examples:

    My table is 3 metres long x 2 metres wide:

    area = 6 sq.m, or

    area = 6m2

    My town is 3 miles x 4 miles:

    area = 12 sq. miles

    We often measure the area of land using:

    hectare = 10,000 square metres

    acre = 4,840 square yards

    Warning!

    There is a difference between "square metres" and "metres

    square". If my room is 10 feet x 10 feet, it is 100 square

    feet but 10 feet square. We can only say this when the

    length and the width are the same.