这些东西卖多少钱？它们都没有标价。

How much are these? They don't have a price on them.

它们两英尺厚。

They're two feet thick.

古董的价值依它们的保存状况和稀有程度而定。

The value of antiques will depend on their condition and rarity.

必须把这些事件同它们的历史环境联系起来看。

You must place these events in their historical context.

它们的年龄可从其生长速度来推定。

Their age can be determined by extrapolation from their growth rate.

小狗崽儿一出生就和它们的妈妈分开了。

The puppies were parted from their mother at birth.

你拿那些火柴做什么？把它们交给我。

What are you doing with those matches? Give them to me.

你需要保存这些信件吗，还是干脆把它们扔掉？

Do you need to keep these letters or shall we bin them?

狮子逼近它们的猎物。

The lions closed in on their prey.

我们说过要保存它们的。

We said we would keep them.

它们是用拉绳系紧的。

They fasten with a drawstring.

列出各点，把它们分成“可取的”和“绝对必要的”两类。

Make a list of points and separate them into 'desirable' and 'essential'.