求一首英语诗及翻译，一句英语，一句翻译。

Love's
Witness
爱情的见证

Slight
unpremeditated
Words
are
borne
By
every
common
Wind
into
the
Air;
Carelessly
utter'd,
die
as
soon
as
born,
And
in
one
instant
give
both
Hope
and
Fear:
Breathing
all
Contraries
with
the
same
Wind
According
to
the
Caprice
of
the
Mind.
But
Billetdoux
are
constant
Witnesses,
Substantial
Records
to
Eternity;
Just
Evidences,
who
the
Truth
confess,
On
which
the
Lover
safely
may
rely;
They're
serious
Thoughts,
digested
and
resolv'd；
And
last,
when
Words
are
into
Clouds
devolv'd.
不加思索的轻率话语，
被每一次平凡的呼吸载入空气；
随便说说，刚出口即消失，
一瞬间给人希望和恐惧：
同一气息呼出万般矛盾心肠，
追随心灵无常的遐想。
但情书则是恒常的见证，
直至永恒的实体记录；
公道的证物，它道出真诚，
恋人能在其上安心依附；
它们是严肃的思想，经过深思熟虑；
当话语在云外消失，它们还将延续。