We think it should be increased to at least two hours a week.

我们认为应该增加到每周至少两个小时。

It should be a fairly smooth walk to begin with because it's a straight path.

一开始应该是相当平坦的路，因为这是一条直路。

If you've already paid for the air tickets and for homestay, it should be OK.

如果你已经支付了机票和寄宿费用，那应该没问题。

Measure the gap; it should be exactly half-inch.

测量这个间隙，它应该正好是半英寸。

Remember, when you promise something, it should be a promise that will be kept.

你要记住，答应别人的事要一诺千金。

Can you help me find my phone? It should be somewhere.

你能帮我找一下我的手机吗？它应该在某处。

The language in this book is too formal; it should be anglicized a bit.

这本书的语言太正式了，应该口语化一些。

The smell of n-butanol is strong, so it should be used in a well-ventilated area.

正丁醇的气味很强烈，所以要在通风良好的地方使用。

The smell of xylene is very strong, so it should be used in a well-ventilated area.

二甲苯的气味很强烈，需要在通风良好的地方使用。

It should be kept private.

应该是保密的。