occluded front
quasi-stationary front
axis of trough
shear line
intertropical convergence zone
cumuliform cloud
cirriform cloud
stratiform cloud
cirrus
striations
tenuous
Cloud amount
Open (O) less than 20%
Mostly open (MOP) 20-50%
Mostly covered (MOC) 50-80%
Covered (C) more than 80%
vortex
millibar
hectopascal
资料来源：国际海员之家网站：
http://www.seafarer.com.cn/englearn/englearn.htm
quasi-stationary front
axis of trough
shear line
intertropical convergence zone
cumuliform cloud
cirriform cloud
stratiform cloud
cirrus
striations
tenuous
Cloud amount
Open (O) less than 20%
Mostly open (MOP) 20-50%
Mostly covered (MOC) 50-80%
Covered (C) more than 80%
vortex
millibar
hectopascal
资料来源：国际海员之家网站：
http://www.seafarer.com.cn/englearn/englearn.htm
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