The footprints, which have been dated by soot deposited from the torch the child was carrying, are estimated to be about 26, 000 years old.
从旁遗落的火炬烟灰上推断，足迹已经存在大约26000年了。
The ash contains minerals such as zircon that can be dated precisely from the radioactive decay of some of their components.
这些火山灰中含有锆石等矿物，这些矿物中的某些组分允许进行精确的放射性测年(以确定精确的年代数据)。
The find, which has been dated to be at least 28, 000 years old and found in a cave near Ulm in Germany, was made from siltstone and was apparently discarded after being broken.
这个在德国南部城市乌尔姆附近洞穴中的发现，至少可以追溯到28000年以前，它是用沙泥岩制成，并在破损后被丢弃。
Each document to show B/L number and date and to be dated not earlier than 7 days from B/L.
显示提单编号和日期的每张信用证，其开具日期不得早于提单日期7天。
The footprints, which have been dated by soot deposited from the torch the child was carrying, are estimated to be about 26,000 years old.
通过孩子手里火炬所掉下来的灰尘推算，这些脚印约有两万六千年的历史了。
The footprints, which have been dated by soot deposited from the torch the child was carrying, are estimated to be about 26,000 years old.
通过孩子手里火炬所掉下来的灰尘推算，这些脚印约有两万六千年的历史了。
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