<s>
The	O
sections	O
below	O
give	O
objective	O
criteria	O
for	O
evaluating	O
the	O
usability	O
of	O
machine	B-Application
translation	I-Application
software	O
output	O
.	O
</s>
<s>
does	O
the	O
translation	O
method	O
show	O
stationarity	B-Algorithm
or	O
produce	O
a	O
canonical	O
form	O
?	O
</s>
<s>
The	O
United	O
States	O
National	O
Institute	O
of	O
Standards	O
and	O
Technology	O
conducts	O
annual	O
evaluations	O
of	O
machine	B-Application
translation	I-Application
systems	I-Application
based	O
on	O
the	O
BLEU-4	O
criterion	O
.	O
</s>
<s>
Do	O
repeated	O
re-translations	O
preserve	O
the	O
semantics	B-Application
of	O
the	O
original	O
sentence	O
?	O
</s>
<s>
This	O
raises	O
the	O
issue	O
of	O
trustworthiness	O
when	O
relying	O
on	O
a	O
machine	B-Application
translation	I-Application
system	I-Application
embedded	O
in	O
a	O
Life-critical	B-Application
system	I-Application
in	O
which	O
the	O
translation	B-Application
system	I-Application
has	O
input	O
to	O
a	O
Safety	B-Application
Critical	I-Application
Decision	O
Making	O
process	O
.	O
</s>
<s>
Conjointly	O
it	O
raises	O
the	O
issue	O
of	O
whether	O
in	O
a	O
given	O
use	O
the	O
software	O
of	O
the	O
machine	B-Application
translation	I-Application
system	I-Application
is	O
safe	O
from	O
hackers	O
.	O
</s>
<s>
It	O
is	O
not	O
known	O
whether	O
this	O
feature	O
of	O
Google	O
Translate	O
was	O
the	O
result	O
of	O
a	O
joke/hack	O
or	O
perhaps	O
an	O
unintended	O
consequence	O
of	O
the	O
use	O
of	O
a	O
method	O
such	O
as	O
statistical	B-General_Concept
machine	I-General_Concept
translation	I-General_Concept
.	O
</s>
<s>
If	O
it	O
is	O
an	O
unintended	O
consequence	O
of	O
the	O
use	O
of	O
a	O
method	O
such	O
as	O
statistical	B-General_Concept
machine	I-General_Concept
translation	I-General_Concept
,	O
and	O
not	O
a	O
joke/hack	O
,	O
then	O
this	O
event	O
is	O
a	O
demonstration	O
of	O
a	O
potential	O
source	O
of	O
critical	O
unreliability	O
in	O
the	O
statistical	B-General_Concept
machine	I-General_Concept
translation	I-General_Concept
method	O
.	O
</s>
